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# Microsoft Defender for Office 365 vs Mimecast Email & Collaboration Security Comparison - What are their main differences?

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Microsoft Defender for...Mimecast Email &...[+ Add Product](#)

Pricing

**Microsoft Defender for Office 365**

**$2.00** 1 User Per Month · Microsoft Defender for Office Plan 1

**$5.00** 1 User Per Month · Microsoft Defender for Office 365 Plan 2

**Mimecast Email & Collaboration Security**
Free Trial

**Contact Vendor for Pricing** · Basic

**Pricing Insights**
from reviews

Perceived Cost

**Microsoft Defender for Office 365**
$$$$$

**Mimecast Email & Collaboration Security**
$$$$$

Average Discount

**Microsoft Defender for Office 365**
12%2% more

**Mimecast Email & Collaboration Security**
10%

Uncover valuable pricing insights from real user feedback to improve your shopping experience.
See it for free

Time to Implement

**Microsoft Defender for Office 365** 6 months
Based on 100 responses

**Mimecast Email & Collaboration Security** 6 months
Based on 100 responses

Return on Investment

**Microsoft Defender for Office 365** 6 months
Based on 100 responses

**Mimecast Email & Collaboration Security** 6 months
Based on 100 responses

**Pros & Cons**
from reviews

**Microsoft Defender for Office 365**

Ease of Use (9)

Security (9)

Complexity (8)

False Positives (6)

**Mimecast Email & Collaboration Security**

Email Security (49)

Ease of Use (44)

Complexity (21)

Email Filtering Issues (17)

Integrations

**Microsoft Defender for Office 365**
[

 ![Product Avatar Image](https://images.g2crowd.com/uploads/product/image/large_detail/large_detail_e89d21750715f4646ed61c011b2917dc/adobe-acrobat.png "Product Avatar Image")

Adobe Acrobat

](https://www.g2.com/products/adobe-acrobat/reviews)[

 ![Product Avatar Image](https://images.g2crowd.com/uploads/product/image/large_detail/large_detail_ae5d46296d0f8afa0fd352fc44bf419d/microsoft365.png "Product Avatar Image")

Microsoft 365

](https://www.g2.com/products/microsoft365/reviews)[

 ![Product Avatar Image](https://images.g2crowd.com/uploads/product/image/large_detail/large_detail_790f5095f4e17577cead05669971b794/microsoft-onedrive-for-business.jpg "Product Avatar Image")

Microsoft OneDrive

](https://www.g2.com/products/microsoft-onedrive-for-business/reviews)[

 ![Product Avatar Image](https://images.g2crowd.com/uploads/product/image/large_detail/large_detail_69054bc7d40597b06fc3905720ccc914/microsoft-outlook.png "Product Avatar Image")

Outlook

](https://www.g2.com/products/microsoft-outlook/reviews)[
View all
](https://www.g2.com/products/microsoft-microsoft-defender-for-office-365/integrations)

**Mimecast Email & Collaboration Security**
Not enough data

Screenshots

**Microsoft Defender for Office 365**
 ![Microsoft Defender for Office 365 screenshot](https://images.g2crowd.com/cdn-cgi/image/width=600,height=600,fit=scale-down,format=auto,onerror=redirect,/https://images.g2crowd.com/uploads/attachment/file/1244899/MicrosoftTeams-image-_1_.png)

**Mimecast Email & Collaboration Security**
No screenshot available

**Ratings**
from reviews

Meets Requirements

**Microsoft Defender for Office 365**

**9.0** /10

Based on 232 responses

**Mimecast Email & Collaboration Security**

**9.0** /10

Based on 293 responses

Ease of Use

**Microsoft Defender for Office 365**

**8.9** /10

Based on 235 responses

**Mimecast Email & Collaboration Security**

**8.0** /10

Based on 300 responses

Ease of Setup

**Microsoft Defender for Office 365**

**8.7** /10

Based on 119 responses

**Mimecast Email & Collaboration Security**

**8.0** /10

Based on 235 responses

Ease of Admin

**Microsoft Defender for Office 365**

**8.9** /10

Based on 101 responses

**Mimecast Email & Collaboration Security**

**7.9** /10

Based on 225 responses

Quality of Support

**Microsoft Defender for Office 365**

**8.7** /10

Based on 226 responses

**Mimecast Email & Collaboration Security**

**8.4** /10

Based on 282 responses

Has the product been a good partner in doing business?

**Microsoft Defender for Office 365**

**8.7** /10

Based on 102 responses

**Mimecast Email & Collaboration Security**

**8.7** /10

Based on 224 responses

Product Direction (% positive)

**Microsoft Defender for Office 365**

**9.4** /10

Based on 223 responses

**Mimecast Email & Collaboration Security**

**8.8** /10

Based on 282 responses

**Features**
ratings from reviews

Cloud Email Security

**8.8** /10

Based on 164 responses

**8.5** /10

Based on 158 responses

Intelligent Email Protection

**8.9** /10

Based on 5 responses

**8.7** /10

Based on 145 responses

Secure Email Gateway

Not enough data

**9.1** /10

Based on 146 responses

Uncover more feature rated insights from real users to improve your shopping experience.

See it for free

Email Anti-spam

**7.8** /10

Based on 15 responses

Not enough data

User Insights

**Reviewers' Company Size**

Small-Business(50 or fewer emp.)
25.8%

Mid-Market(51-1000 emp.)
38.2%

Enterprise(\> 1000 emp.)
36.0%

Small-Business(50 or fewer emp.)
25.8%

Mid-Market(51-1000 emp.)
38.2%

Enterprise(\> 1000 emp.)
36.0%

Small-Business(50 or fewer emp.)
18.4%

Mid-Market(51-1000 emp.)
64.9%

Enterprise(\> 1000 emp.)
16.8%

Small-Business(50 or fewer emp.)
18.4%

Mid-Market(51-1000 emp.)
64.9%

Enterprise(\> 1000 emp.)
16.8%

**Reviewers' Industry**

[![Microsoft Defender for Office 365](https://images.g2crowd.com/uploads/product/hd_favicon/a8a99a96fda235658139f710592f8a53/microsoft-microsoft-defender-for-office-365.svg "Microsoft Defender for Office 365")](https://www.g2.com/products/microsoft-microsoft-defender-for-office-365/reviews)
Microsoft Defender for Office 365

Information Technology and Services
25.6%

Computer & Network Security
12.5%

Computer Software
12.5%

Financial Services
5.3%

Accounting
2.8%

Other
41.3%

[![Mimecast Email & Collaboration Security](https://images.g2crowd.com/uploads/product/hd_favicon/c97922b8b687c48a1c77730e5b621a3a/mimecast-email-collaboration-security.svg "Mimecast Email & Collaboration Security")](https://www.g2.com/products/mimecast-email-collaboration-security/reviews)
Mimecast Email & Collaboration Security

Legal Services
8.3%

Information Technology and Services
7.8%

Financial Services
7.2%

Computer & Network Security
4.4%

Construction
4.4%

Other
67.8%

Alternatives

**Microsoft Defender for Office 365 Alternatives**

 ![Proofpoint Core Email Protection](https://images.g2crowd.com/uploads/product/hd_favicon/8adf2eedd5616a9f5e200c4520f6d30d/proofpoint-core-email-protection.svg "Proofpoint Core Email Protection")

[
Proofpoint Core Email...
](/products/proofpoint-core-email-protection/reviews)

 ![SpamTitan Email Security](https://images.g2crowd.com/uploads/product/hd_favicon/1553620140/spamtitan-email-security.svg "SpamTitan Email Security")

[
SpamTitan Email Security
](/products/spamtitan-email-security/reviews)

 ![IRONSCALES](https://images.g2crowd.com/uploads/product/hd_favicon/06b1561b9d4413964954a7658e64f056/ironscales.svg "IRONSCALES")

[
IRONSCALES
](/products/ironscales/reviews)

 ![Symantec Email Security.Cloud](https://images.g2crowd.com/uploads/product/hd_favicon/7e0271a147c13a70a6587f9586b454a0/symantec-email-security-cloud.png "Symantec Email Security.Cloud")

[
Symantec Email Security.Cloud
](/products/symantec-email-security-cloud/reviews)

**Mimecast Email & Collaboration Security Alternatives**

 ![Proofpoint Core Email Protection](https://images.g2crowd.com/uploads/product/hd_favicon/8adf2eedd5616a9f5e200c4520f6d30d/proofpoint-core-email-protection.svg "Proofpoint Core Email Protection")

[
Proofpoint Core Email...
](/products/proofpoint-core-email-protection/reviews)

 ![SpamTitan Email Security](https://images.g2crowd.com/uploads/product/hd_favicon/1553620140/spamtitan-email-security.svg "SpamTitan Email Security")

[
SpamTitan Email Security
](/products/spamtitan-email-security/reviews)

 ![Cloudflare One (SASE)](https://images.g2crowd.com/uploads/product/image/thumb_square/thumb_square_b2231a414cb9f3f7c194f65af32b723e/cloudflare-one-sase.png "Cloudflare One (SASE)")

[
Cloudflare One (SASE)
](/products/cloudflare-one-sase/reviews)

 ![Cisco Secure Email Threat Defense](https://images.g2crowd.com/uploads/product/image/thumb_square/thumb_square_38b2594bf3660b0b77b70d2dd1b16fee/cisco-secure-email-threat-defense.jpg "Cisco Secure Email Threat Defense")

[
Cisco Secure Email Threat...
](/products/cisco-secure-email-threat-defense/reviews)

## Microsoft Defender for... vs Mimecast Email &... FAQs

Generated using AI

Last updated: August 14, 2026

### 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.