# Microsoft Defender for Office 365 vs Mimecast Advanced Email Security Comparison
---
## AI Generated Summary
- **G2 reviewers report** that Mimecast Advanced Email Security excels in its **protection against phishing and malware** , with users highlighting its **AI-powered, multi-layer detection** capabilities. This makes it a strong choice for organizations looking for robust security measures.
- **Users say** that Microsoft Defender for Office 365 benefits from its **seamless integration with the Microsoft 365 ecosystem** , which is particularly advantageous for businesses managing multiple client tenants. This integration reduces the need for additional tools and infrastructure.
- **Reviewers mention** that Mimecast's interface is **intuitive and user-friendly** , making daily monitoring and policy updates straightforward. This ease of management is a significant plus for teams that prioritize operational efficiency.
- **According to verified reviews** , Microsoft Defender for Office 365 is praised for its **real-time alerts and comprehensive threat reports** , which help users stay informed about potential threats and enhance their overall security posture.
- **G2 reviewers highlight** that while Mimecast Advanced Email Security offers excellent spam and virus defense, some users find it challenging to configure for specific workflows, which can lead to a steeper learning curve for new users.
- **Users appreciate** that Microsoft Defender for Office 365 acts as a **"high-tech bouncer"** for digital workspaces, providing advanced threat protection that goes beyond basic email filtering, thus ensuring a higher level of security for users.



---
## Frequently Asked Questions

### What is the difference between Mimecast Advanced Email... vs Microsoft Defender for...?

Microsoft Defender for Office 365 stands out for higher reviewer satisfaction in setup, support, and ease of use, while Mimecast Advanced Email Security is noted for its robust email security features and mid-market focus.

| [Mimecast Advanced Email Security](https://www.g2.com/products/mimecast-advanced-email-security/reviews) | [Microsoft Defender for Office 365](https://www.g2.com/products/microsoft-microsoft-defender-for-office-365/reviews) |
| --- | --- |
| 4.4/5 (350 reviews) | 4.5/5 (299 reviews) |
| Mid-Market | Mid-Market |
| 7.9 | 8.7 |
| 8.3 | 8.7 |
| Email Security (40 all-time mentions) | Ease of Use (9 all-time mentions) |



### How do the pricing models of Mimecast Advanced Email... and Microsoft Defender for... compare?

Microsoft Defender for Office 365 is rated higher for value, with reviewers expressing greater satisfaction with its price and cost structure.

- **Mimecast Advanced Email Security:** In recent reviews, several buyers note that Mimecast offers strong security but mention the cost can be higher compared to alternatives, especially for advanced features.
- **Microsoft Defender for Office 365:** Reviewers consistently highlight that Defender is included with Microsoft 365 subscriptions, making it a cost-effective solution for organizations already using Microsoft products.
- **Switching reasons:** Recent reviewers cite integration with existing Microsoft 365 environments and bundled pricing as key reasons for choosing Defender over standalone solutions.



### What are the best alternatives to Mimecast Advanced Email... and Microsoft Defender for...?

The top three alternatives to Mimecast Advanced Email Security and Microsoft Defender for Office 365 are Proofpoint Core Email Protection, SpamTitan Email Security, and Cloudflare One (SASE).

| Product | G2 Rating (reviews) | Largest Segment | Pricing Insight | Top Reviewer-Cited Strength |
| --- | --- | --- | --- | --- |
| [Mimecast Advanced Email Security](https://www.g2.com/products/mimecast-advanced-email-security/reviews) | 4.4/5 (350 reviews) | Mid-Market | — | Email Security (40 all-time mentions) |
| [Microsoft Defender for Office 365](https://www.g2.com/products/microsoft-microsoft-defender-for-office-365/reviews) | 4.5/5 (299 reviews) | Mid-Market | — | Ease of Use (9 all-time mentions) |
| [Proofpoint Core Email Protection](https://www.g2.com/products/proofpoint-core-email-protection/reviews) | 4.6/5 (601 reviews) | Enterprise | — | Robust threat protection |
| [SpamTitan Email Security](https://www.g2.com/products/spamtitan-email-security/reviews) | 4.5/5 (199 reviews) | Small-Business | — | Effective spam filtering |
| [Cloudflare One (SASE)](https://www.g2.com/products/cloudflare-one-sase/reviews) | 4.6/5 (105 reviews) | Small-Business | — | Comprehensive security platform |



### Which Cloud Email Security features should I prioritize when comparing Mimecast Advanced Email... and Microsoft Defender for...?

Buyers should prioritize phishing protection, spam filtering, integration capabilities, ease of administration, and reporting when comparing Mimecast Advanced Email Security and Microsoft Defender for Office 365.

- **Phishing Protection:** Mimecast Advanced Email Security (20 all-time mentions), Microsoft Defender for Office 365 (6 all-time mentions).
- **Spam Filtering:** Mimecast Advanced Email Security (16 all-time mentions), Microsoft Defender for Office 365 (spam filtering cited in recent reviews).
- **Integration Capabilities:** Mimecast Advanced Email Security (15 all-time mentions), Microsoft Defender for Office 365 (7 all-time mentions, especially with Microsoft 365).
- **Ease of Administration:** Mimecast Advanced Email Security (Ease of Admin score: 7.9), Microsoft Defender for Office 365 (8.9).
- **Reporting:** Both products have reviewer-cited reporting strengths and limitations, with reporting mentioned as a focus feature.



### What are the pros and cons of Mimecast Advanced Email... vs Microsoft Defender for...?

Mimecast Advanced Email Security is strongest in email security and customization, while Microsoft Defender for Office 365 excels in ease of use and integration with Microsoft 365.

- **Mimecast Advanced Email Security strengths:** Email Security (40 all-time mentions), robust phishing protection (20), spam blocking (22), and flexible policy customization.
- **Mimecast Advanced Email Security trade-offs:** Complexity (17 all-time mentions), configuration difficulties (12), false positives (13), and some reviewers note challenges with customer support (12).
- **Microsoft Defender for Office 365 strengths:** Ease of use (9 all-time mentions), strong integration with Microsoft 365 (8), real-time protection (5), and automated threat response.
- **Microsoft Defender for Office 365 trade-offs:** Complexity (8 all-time mentions), false positives (6), configuration difficulties (4), and limited reporting (4).



### Is Mimecast Advanced Email... or Microsoft Defender for... better for small businesses?

Microsoft Defender for Office 365 is the better fit for small businesses, supported by reviewer sentiment and its integration with Microsoft 365.

- **Mimecast Advanced Email Security:** Largest segment is Mid-Market; reviewers note strong security but mention a steeper learning curve and higher cost for small organizations.
- **Microsoft Defender for Office 365:** Largest segment is Mid-Market; recent small-business reviewers highlight its value, ease of use, and integration with existing Microsoft subscriptions as key advantages for smaller teams.



### Which Cloud Email Security platform has better integrations?

Microsoft Defender for Office 365 is favored for integrations, especially with Microsoft 365 and related tools.

- **Mimecast Advanced Email Security:** Integrations are mentioned in 15 all-time reviews, with recent reviewers noting Outlook and Teams integration.
- **Microsoft Defender for Office 365:** Microsoft 365 integration is cited in 13 all-time reviews, with additional mentions of integration with Teams, SharePoint, and OneDrive in recent feedback.



### How do Mimecast Advanced Email... and Microsoft Defender for... compare on customer support?

Microsoft Defender for Office 365 scores higher on Quality of Support, but the difference is below the materiality threshold, indicating near parity (Mimecast Advanced Email Security: 8.3, Microsoft Defender for Office 365: 8.7).

- **Mimecast Advanced Email Security:** Reviewers frequently mention responsive and knowledgeable support, though some cite inconsistent experiences and challenges during critical incidents.
- **Microsoft Defender for Office 365:** Reviewers highlight strong support for Microsoft 365 customers, but some note slow response times and difficulty reaching support directly.



### Which is easier to implement, Mimecast Advanced Email... or Microsoft Defender for...?

Microsoft Defender for Office 365 is rated higher for Ease of Setup (8.7 vs. 7.9), with reviewers citing straightforward deployment, especially for existing Microsoft 365 users.

- **Mimecast Advanced Email Security:** Reviewers describe setup as manageable but note a learning curve and more complex configuration, especially for advanced policies.
- **Microsoft Defender for Office 365:** Reviewers consistently report easy setup, particularly when already using Microsoft 365, with minimal additional infrastructure required.



### Which product has better Reporting?

Microsoft Defender for Office 365 is favored for Reporting, with reviewers citing more advanced and integrated reporting capabilities.

- **Mimecast Advanced Email Security:** Reporting is frequently mentioned in reviews, with some users noting limitations in customization and manual export processes.
- **Microsoft Defender for Office 365:** Reporting is highlighted as a strength in recent reviews, with integrated dashboards and real-time threat insights, though some reviewers mention a learning curve for advanced features.



| | Microsoft Defender for Office 365 | Mimecast Advanced Email Security | 
|---|---|---|
| **Star Rating** | 4.5 out of 5 | 4.4 out of 5 | 
| **Total Reviews** | 298 | 365 | 
| **Largest Market Segment** | Mid-Market (37.9% of reviews) | Mid-Market (66.8% of reviews) | 
| **Entry Level Price** | $2.00 1 User Per Month | No pricing available | 

---
## Top Pros & Cons

### Microsoft Defender for Office 365

Pros:
- Ease of Use (9 reviews)
- Security (8 reviews)

Cons:
- Complexity (8 reviews)
- False Positives (6 reviews)

### Mimecast Advanced Email Security

Pros:
- Email Security (49 reviews)
- Ease of Use (44 reviews)

Cons:
- Complexity (21 reviews)
- Email Filtering Issues (17 reviews)

---
## Ratings Comparison
| Rating | Microsoft Defender for Office 365 | Mimecast Advanced Email Security | 
|---|---|---|
  | **Meets Requirements** | 9.0 (231 reviews) | 8.9 (282 reviews) | 
  | **Ease of Use** | 8.9 (234 reviews) | 8.0 (289 reviews) | 
  | **Ease of Setup** | 8.7 (118 reviews) | 7.9 (224 reviews) | 
  | **Ease of Admin** | 8.9 (100 reviews) | 7.9 (217 reviews) | 
  | **Quality of Support** | 8.7 (225 reviews) | 8.3 (271 reviews) | 
  | **Has the product been a good partner in doing business?** | 8.8 (101 reviews) | 8.7 (216 reviews) | 
  | **Product Direction (% positive)** | 9.4 (222 reviews) | 8.8 (273 reviews) | 

---
## Pricing

### Microsoft Defender for Office 365

#### Entry-Level Pricing

Plan: Microsoft Defender for Office Plan 1

Price: $2.00 1 User Per Month

Description: Defender for Office 365 Plan 1 offers protection against advanced attacks across email and collaboration tools in Office 365.

Key Features:
- Protection against advanced attacks, such as phishing, malware, spam, and business email compromise
- Protection beyond email (Microsoft Teams, SharePoint, OneDrive, and Office apps)
- Internal email protection

[Browse all 2 editions](https://www.g2.com/products/microsoft-microsoft-defender-for-office-365/pricing)

#### Free Trial

No

### Mimecast Advanced Email Security

#### Entry-Level Pricing

No pricing available

#### Free Trial

Yes

---
## Features Comparison By Category

### Email Security

| Product | Score | Reviews |
|---|---|---|
| **Microsoft Defender for Office 365** | N/A | N/A |
| **Mimecast Advanced Email Security** | N/A | N/A |

#### Additional Functionality

| Feature | Microsoft Defender for Office 365 | Mimecast Advanced Email Security | 
|---|---|---|
| **Phishing Protection** | Not enough data | Not enough data | 
| **Threat Response** | Not enough data | Not enough data | 
| **Domain Check** | Not enough data | Not enough data | 
| **Security Auditing** | Not enough data | Not enough data | 
| **AI/Machine Learning** | Not enough data | Not enough data | 
| **Third-Party Integrations** | Not enough data | Not enough data | 
| **AI Copilot** | Not enough data | Not enough data | 
| **Reporting/Analytics** | Not enough data | Not enough data | 
| **Anomaly/Malware Detection** | Not enough data | Not enough data | 
| **SURLB/URIBL Filtering** | Not enough data | Not enough data | 
| **Activity Dashboard** | Not enough data | Not enough data | 
| **Scheduled/Automated Reports** | Not enough data | Not enough data | 
| **For MSPs** | Not enough data | Not enough data | 
| **Whitelisting/Blacklisting** | Not enough data | Not enough data | 
| **Fraud Detection** | Not enough data | Not enough data | 
| **Spam Blocker** | Not enough data | Not enough data | 
| **Spam Quarantine** | Not enough data | Not enough data | 
| **API** | Not enough data | Not enough data | 
| **Data Leak Prevention** | Not enough data | Not enough data | 
| **Encryption** | Not enough data | Not enough data | 
| **Audit Trail** | Not enough data | Not enough data | 
| **Real-Time Monitoring** | Not enough data | Not enough data | 
| **Spam Analysis** | Not enough data | Not enough data | 
| **Policy Management** | Not enough data | Not enough data | 
| **Alerts/Escalation** | Not enough data | Not enough data | 
| **Email Management** | Not enough data | Not enough data | 
| **Vulnerability Scanning** | Not enough data | Not enough data | 
| **Generative AI** | Not enough data | Not enough data | 
| **Threat Protection** | Not enough data | Not enough data | 
| **Email Attachment Protection** | Not enough data | Not enough data | 
| **Email Filtering** | Not enough data | Not enough data | 
| **Two-Factor Authentication** | Not enough data | Not enough data | 

### Cloud Email Security

| Product | Score | Reviews |
|---|---|---|
| **Microsoft Defender for Office 365** | 8.8/10 | 164 |
| **Mimecast Advanced Email Security** | 8.5/10 | 148 |

#### Administration

| Feature | Microsoft Defender for Office 365 | Mimecast Advanced Email Security | 
|---|---|---|
| **Intelligence Reporting** | 8.8 (148 reviews) ✓ Verified | 8.0 (120 reviews) | 
| **Email Integration Suppor** | 9.0 (147 reviews) ✓ Verified | 8.5 (125 reviews) | 
| **Access Management** | 8.8 (140 reviews) ✓ Verified | 8.2 (119 reviews) | 
| **Data Loss Prevention** | 8.5 (140 reviews) ✓ Verified | 8.2 (101 reviews) | 

#### Maintenance

| Feature | Microsoft Defender for Office 365 | Mimecast Advanced Email Security | 
|---|---|---|
| **Auditing** | 8.7 (138 reviews) ✓ Verified | 8.1 (116 reviews) | 
| **Allow and block lists** | 8.8 (145 reviews) ✓ Verified | 8.9 (122 reviews) | 
| **Compliance** | 8.8 (142 reviews) | 8.5 (109 reviews) | 
| **Archiving** | 8.6 (135 reviews) ✓ Verified | 8.6 (115 reviews) | 

#### Security

| Feature | Microsoft Defender for Office 365 | Mimecast Advanced Email Security | 
|---|---|---|
| **Anti-Malware/Anti-Spam** | 9.0 (151 reviews) ✓ Verified | 9.0 (139 reviews) | 
| **Encryption** | 8.9 (141 reviews) | 8.2 (110 reviews) | 
| **Quarantine** | 8.7 (145 reviews) ✓ Verified | 9.0 (131 reviews) | 
| **Advanced Threat Protection (ATP)** | 9.0 (144 reviews) ✓ Verified | 8.8 (127 reviews) | 
| **Anti-Phishing** | 9.0 (148 reviews) ✓ Verified | 8.8 (134 reviews) | 
| **Account takeover prevention** | 8.7 (138 reviews) ✓ Verified | 7.7 (88 reviews) | 

### Intelligent Email Protection

| Product | Score | Reviews |
|---|---|---|
| **Microsoft Defender for Office 365** | 8.9/10 | 5 |
| **Mimecast Advanced Email Security** | 8.7/10 | 140 |

#### Administration

| Feature | Microsoft Defender for Office 365 | Mimecast Advanced Email Security | 
|---|---|---|
| **Compliance** | Not enough data | 8.5 (112 reviews) | 
| **Intelligence Reporting** | Not enough data | 8.6 (124 reviews) | 
| **Email Clients** | 9.0 (5 reviews) | 9.1 (128 reviews) | 
| **Role-Based Rules** | Not enough data | 8.9 (127 reviews) | 

#### Detection

| Feature | Microsoft Defender for Office 365 | Mimecast Advanced Email Security | 
|---|---|---|
| **Data Exfiltration Detection** | Not enough data | 8.3 (115 reviews) | 
| **Activity Monitoring** | Not enough data | 8.5 (119 reviews) | 
| **Real-Time Detection** | 8.7 (5 reviews) | 8.9 (126 reviews) | 

#### Protection

| Feature | Microsoft Defender for Office 365 | Mimecast Advanced Email Security | 
|---|---|---|
| **Targeted Attack Prevention** | Not enough data | 9.0 (125 reviews) | 
| **Policy Enforcement** | Not enough data | 8.9 (131 reviews) | 
| **Spam Filtering** | 9.0 (5 reviews) | 9.2 (134 reviews) | 

#### Agentic AI - Intelligent Email Protection

| Feature | Microsoft Defender for Office 365 | Mimecast Advanced Email Security | 
|---|---|---|
| **Autonomous Task Execution** | Not enough data | 7.9 (8 reviews) | 
| **Adaptive Learning** | Not enough data | 8.1 (8 reviews) | 

### Secure Email Gateway

| Product | Score | Reviews |
|---|---|---|
| **Microsoft Defender for Office 365** | N/A | N/A |
| **Mimecast Advanced Email Security** | 8.9/10 | 140 |

#### Functionality

| Feature | Microsoft Defender for Office 365 | Mimecast Advanced Email Security | 
|---|---|---|
| **Anti-Spam** | Not enough data | 9.1 (135 reviews) ✓ Verified | 
| **Anti-Malware** | Not enough data | 9.2 (136 reviews) ✓ Verified | 
| **Anti-Phishing** | Not enough data | 8.8 (137 reviews) ✓ Verified | 
| **SURLB/URIBL Filtering** | Not enough data | 9.0 (131 reviews) ✓ Verified | 
| **Quarantine** | Not enough data | 9.0 (134 reviews) ✓ Verified | 
| **Outbound Email Monitoring** | Not enough data | 9.1 (126 reviews) ✓ Verified | 
| **Advanced Threat Intelligence/Protection** | Not enough data | 9.0 (130 reviews) ✓ Verified | 
| **Archiving** | Not enough data | 8.8 (123 reviews) ✓ Verified | 
| **Reporting** | Not enough data | 8.4 (132 reviews) ✓ Verified | 
| **On-prem deployment** | Not enough data | Feature Not Available | 
| **Email Attachment Protection** | Not enough data | Not enough data | 
| **Phishing Protection** | Not enough data | Not enough data | 
| **Single Sign On** | Not enough data | Not enough data | 
| **Email Monitoring** | Not enough data | Not enough data | 
| **Real-Time Monitoring** | Not enough data | Not enough data | 

#### Agentic AI - Secure Email Gateway

| Feature | Microsoft Defender for Office 365 | Mimecast Advanced Email Security | 
|---|---|---|
| **Proactive Assistance** | Not enough data | Not enough data | 

#### Additional Functionality

| Feature | Microsoft Defender for Office 365 | Mimecast Advanced Email Security | 
|---|---|---|
| **Activity Dashboard** | Not enough data | Not enough data | 
| **Audit Trail** | Not enough data | Not enough data | 
| **Allow/Block List** | Not enough data | Not enough data | 
| **Generative AI** | Not enough data | Not enough data | 
| **Vulnerability Scanning** | Not enough data | Not enough data | 
| **Active Directory Integration** | Not enough data | Not enough data | 
| **Threat Response** | Not enough data | Not enough data | 
| **Search** | Not enough data | Not enough data | 
| **Intrusion Detection System** | Not enough data | Not enough data | 
| **Compliance Management** | Not enough data | Not enough data | 
| **Spam Blocker** | Not enough data | Not enough data | 
| **Encryption** | Not enough data | Not enough data | 
| **Data Verification** | Not enough data | Not enough data | 
| **Audit Management** | Not enough data | Not enough data | 
| **Alerts/Escalation** | Not enough data | Not enough data | 
| **Policy Management** | Not enough data | Not enough data | 
| **Customizable Reports** | Not enough data | Not enough data | 
| **Archiving & Retention** | Not enough data | Not enough data | 
| **Data Synchronization** | Not enough data | Not enough data | 
| **Activity Tracking** | Not enough data | Not enough data | 
| **Microsoft Outlook Integration** | Not enough data | Not enough data | 
| **SSL Security** | Not enough data | Not enough data | 
| **Secure Login** | Not enough data | Not enough data | 
| **Third-Party Integrations** | Not enough data | Not enough data | 
| **Spam Detection** | Not enough data | Not enough data | 
| **Real-Time Notifications** | Not enough data | Not enough data | 
| **Scheduled/Automated Reports** | Not enough data | Not enough data | 
| **Email Tracking** | Not enough data | Not enough data | 
| **Fraud Detection** | Not enough data | Not enough data | 
| **Event Logs** | Not enough data | Not enough data | 
| **Data Retention Management** | Not enough data | Not enough data | 
| **Backup and Recovery** | Not enough data | Not enough data | 
| **Threat Intelligence** | Not enough data | Not enough data | 
| **Whitelisting/Blacklisting** | Not enough data | Not enough data | 
| **Data Import/Export** | Not enough data | Not enough data | 
| **Two-Factor Authentication** | Not enough data | Not enough data | 
| **Reporting & Statistics** | Not enough data | Not enough data | 
| **Anti Virus** | Not enough data | Not enough data | 
| **Data Loss Prevention** | Not enough data | Not enough data | 
| **Risk Alerts** | Not enough data | Not enough data | 
| **Access Controls/Permissions** | Not enough data | Not enough data | 
| **Password Management** | Not enough data | Not enough data | 
| **AI Copilot** | Not enough data | Not enough data | 
| **Authentication** | Not enough data | Not enough data | 

### Email Anti-spam

| Product | Score | Reviews |
|---|---|---|
| **Microsoft Defender for Office 365** | 7.8/10 | 14 |
| **Mimecast Advanced Email Security** | N/A | N/A |

#### Agentic AI - Email Anti-spam Features

| Feature | Microsoft Defender for Office 365 | Mimecast Advanced Email Security | 
|---|---|---|
| **Autonomous Task Execution** | 8.1 (13 reviews) | Not enough data | 
| **Proactive Assistance** | 7.4 (11 reviews) | Not enough data | 

#### Additional Functionality

| Feature | Microsoft Defender for Office 365 | Mimecast Advanced Email Security | 
|---|---|---|
| **Phishing Protection** | Not enough data | Not enough data | 
| **Data Recovery** | Not enough data | Not enough data | 
| **Archiving & Retention** | Not enough data | Not enough data | 
| **Backup and Recovery** | Not enough data | Not enough data | 
| **Policy Management** | Not enough data | Not enough data | 
| **Email Management** | Not enough data | Not enough data | 
| **Data Loss Prevention** | Not enough data | Not enough data | 
| **Single Sign On** | Not enough data | Not enough data | 
| **Data Storage Management** | Not enough data | Not enough data | 
| **Fraud Detection** | Not enough data | Not enough data | 
| **Email Routing** | Not enough data | Not enough data | 
| **Data Verification** | Not enough data | Not enough data | 
| **Compliance Management** | Not enough data | Not enough data | 
| **Filtering** | Not enough data | Not enough data | 
| **Search/Filter** | Not enough data | Not enough data | 
| **SURLB/URIBL Filtering** | Not enough data | Not enough data | 
| **Security Auditing** | Not enough data | Not enough data | 
| **Data Synchronization** | Not enough data | Not enough data | 
| **Anti Virus** | Not enough data | Not enough data | 
| **Risk Assessment** | Not enough data | Not enough data | 
| **Greylisting** | Not enough data | Not enough data | 
| **Audit Trail** | Not enough data | Not enough data | 
| **Reporting/Analytics** | Not enough data | Not enough data | 
| **Allow/Block List** | Not enough data | Not enough data | 
| **Vulnerability Scanning** | Not enough data | Not enough data | 
| **Active Directory Integration** | Not enough data | Not enough data | 
| **Compression** | Not enough data | Not enough data | 
| **Email Tracking** | Not enough data | Not enough data | 
| **Encryption** | Not enough data | Not enough data | 
| **Anti Spam** | Not enough data | Not enough data | 
| **Disaster Recovery** | Not enough data | Not enough data | 
| **AI Copilot** | Not enough data | Not enough data | 
| **Tagging** | Not enough data | Not enough data | 
| **Secure Data Storage** | Not enough data | Not enough data | 
| **Activity Tracking** | Not enough data | Not enough data | 
| **Spam Blocker** | Not enough data | Not enough data | 
| **Microsoft Outlook Integration** | Not enough data | Not enough data | 
| **Spam Analysis** | Not enough data | Not enough data | 
| **API** | Not enough data | Not enough data | 
| **Categorization/Grouping** | Not enough data | Not enough data | 
| **Event Tracking** | Not enough data | Not enough data | 
| **Inbox Management** | Not enough data | Not enough data | 
| **Spam Detection** | Not enough data | Not enough data | 
| **Authentication** | Not enough data | Not enough data | 
| **Third-Party Integrations** | Not enough data | Not enough data | 
| **Reporting & Statistics** | Not enough data | Not enough data | 
| **Spam Quarantine** | Not enough data | Not enough data | 
| **SSL Security** | Not enough data | Not enough data | 
| **Generative AI** | Not enough data | Not enough data | 
| **Data Retention Management** | Not enough data | Not enough data | 
| **Access Controls/Permissions** | Not enough data | Not enough data | 
| **Monitoring** | Not enough data | Not enough data | 

---
## Categories
**Shared Categories (2):** [Cloud Email Security Solutions](https://www.g2.com/categories/cloud-email-security), [Intelligent Email Protection Software](https://www.g2.com/categories/intelligent-email-protection)

**Unique to Microsoft Defender for Office 365 (1):** [Email Anti-spam Software](https://www.g2.com/categories/email-anti-spam)

**Unique to Mimecast Advanced Email Security (2):** [Secure Email Gateway Software](https://www.g2.com/categories/secure-email-gateway), [Browser Isolation Software](https://www.g2.com/categories/browser-isolation)


---
## Reviewer Demographics

### By Company Size

| Segment | Microsoft Defender for Office 365 | Mimecast Advanced Email Security | 
|---|---|---|
| **Small-Business** | 25.9% | 16.6% | 
| **Mid-Market** | 37.9% | 66.8% | 
| **Enterprise** | 36.2% | 16.6% | 

### By Industry

#### Microsoft Defender for Office 365

- **Information Technology and Services:** 25.7%
- **Computer & Network Security:** 12.5%
- **Computer Software:** 12.5%
- **Financial Services:** 5.4%
- **Accounting:** 2.9%
- **Consulting:** 2.9%
- **Telecommunications:** 2.5%
- **Education Management:** 2.5%
- **Oil & Energy:** 2.5%
- **Higher Education:** 1.8%
- **Other:** 28.9%

#### Mimecast Advanced Email Security

- **Legal Services:** 8.6%
- **Financial Services:** 7.4%
- **Information Technology and Services:** 7.4%
- **Construction:** 4.6%
- **Law Practice:** 4.3%
- **Computer & Network Security:** 4.0%
- **Computer Software:** 4.0%
- **Hospital & Health Care:** 3.7%
- **Insurance:** 3.2%
- **Marketing and Advertising:** 2.6%
- **Other:** 50.1%

---
## Alternatives

### Alternatives to Microsoft Defender for Office 365

- [Proofpoint Core Email Protection](https://www.g2.com/products/proofpoint-core-email-protection/reviews) — 4.6/5 stars (613 reviews)
- [SpamTitan Email Security](https://www.g2.com/products/spamtitan-email-security/reviews) — 4.5/5 stars (199 reviews)
- [IRONSCALES](https://www.g2.com/products/ironscales/reviews) — 4.7/5 stars (70 reviews)
- [Symantec Email Security.Cloud](https://www.g2.com/products/symantec-email-security-cloud/reviews) — 4.1/5 stars (66 reviews)
- [Barracuda Email Gateway Defense](https://www.g2.com/products/barracuda-email-gateway-defense/reviews) — 4.2/5 stars (40 reviews)
- [Cisco Secure Email Threat Defense](https://www.g2.com/products/cisco-secure-email-threat-defense/reviews) — 4.3/5 stars (28 reviews)
- [Proofpoint Essentials for Small Business](https://www.g2.com/products/proofpoint-essentials-for-small-business/reviews) — 4.0/5 stars (24 reviews)
- [Abnormal AI](https://www.g2.com/products/abnormal-ai/reviews) — 4.7/5 stars (89 reviews)
- [Vade](https://www.g2.com/products/vade/reviews) — 4.6/5 stars (180 reviews)
- [Cloudflare One (SASE)](https://www.g2.com/products/cloudflare-one-sase/reviews) — 4.6/5 stars (104 reviews)

### Alternatives to Mimecast Advanced Email Security

- [Proofpoint Core Email Protection](https://www.g2.com/products/proofpoint-core-email-protection/reviews) — 4.6/5 stars (613 reviews)
- [SpamTitan Email Security](https://www.g2.com/products/spamtitan-email-security/reviews) — 4.5/5 stars (199 reviews)
- [Cloudflare One (SASE)](https://www.g2.com/products/cloudflare-one-sase/reviews) — 4.6/5 stars (104 reviews)
- [Cisco Secure Email Threat Defense](https://www.g2.com/products/cisco-secure-email-threat-defense/reviews) — 4.3/5 stars (28 reviews)
- [Abnormal AI](https://www.g2.com/products/abnormal-ai/reviews) — 4.7/5 stars (89 reviews)
- [KnowBe4 Email & Collaboration Security](https://www.g2.com/products/knowbe4-email-collaboration-security/reviews) — 4.5/5 stars (76 reviews)
- [Barracuda Email Gateway Defense](https://www.g2.com/products/barracuda-email-gateway-defense/reviews) — 4.2/5 stars (40 reviews)
- [FortiMail](https://www.g2.com/products/fortimail/reviews) — 4.3/5 stars (25 reviews)
- [N-able Mail Assure](https://www.g2.com/products/n-able-mail-assure/reviews) — 4.0/5 stars (68 reviews)
- [Darktrace / EMAIL](https://www.g2.com/products/darktrace-email/reviews) — 4.1/5 stars (39 reviews)

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## Top Discussions

### Microsoft Defender for Office 365

- Title: [What are the security features of Microsoft 365?](https://www.g2.com/discussions/microsoft-defender-for-office-365-what-are-the-security-features-of-microsoft-365) — 2 comments
  > **Top comment:** "Multi Factor authentication. data encryption, threat protection, data protection, identity and access management are major features of MS Office 365,"
- Title: [Does Microsoft 365 include Microsoft Defender?](https://www.g2.com/discussions/does-microsoft-365-include-microsoft-defender) — 2 comments
  > **Top comment:** "Yes"

### Mimecast Advanced Email Security

- Title: [Has anyone implemented ingesting the Audit logs from Mimecast into Graylog?](https://www.g2.com/discussions/has-anyone-implemented-ingesting-the-audit-logs-from-mimecast-into-graylog) — 3 comments, 1 upvote
  > **Top comment:** "I have not, I just use the built in alerts and mxtoolbox for mail flow."
- Title: [What is Mimecast Email Security with Targeted Threat Protection used for?](https://www.g2.com/discussions/what-is-mimecast-email-security-with-targeted-threat-protection-used-for) — 2 comments
  > **Top comment:** "Mimecast Email Security with Targeted Threat Protection is used to defend against phishing, malware, ransomware, and impersonation attacks.... It provides..."

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**Source:** [G2.com](https://www.g2.com) | [Comparison Page](https://www.g2.com/compare/microsoft-microsoft-defender-for-office-365-vs-mimecast-advanced-email-security)