# Kaspersky Next Optimum vs Thunderbird Comparison

| | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Star Rating** | 4.3 out of 5 | 4.3 out of 5 | 
| **Total Reviews** | 208 | 340 | 
| **Largest Market Segment** | Mid-Market (41.1% of reviews) | Small-Business (65.2% of reviews) | 
| **Entry Level Price** | $77 node/year | No pricing available | 

---
## Top Pros & Cons

### Kaspersky Next Optimum

Pros:
- Blocking (5 reviews)
- Ease of Use (5 reviews)

Cons:
- High Resource Usage (6 reviews)
- Slow Performance (5 reviews)

### Thunderbird

Pros:
- Ease of Use (4 reviews)
- Functionality Features (4 reviews)

Cons:
- Difficult Setup (2 reviews)
- Missing Features (2 reviews)

---
## Ratings Comparison
| Rating | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
  | **Meets Requirements** | 8.9 (173 reviews) | 8.7 (305 reviews) | 
  | **Ease of Use** | 8.6 (174 reviews) | 8.8 (306 reviews) | 
  | **Ease of Setup** | 8.2 (71 reviews) | 8.8 (76 reviews) | 
  | **Ease of Admin** | 8.4 (65 reviews) | 8.4 (58 reviews) | 
  | **Quality of Support** | 8.4 (167 reviews) | 7.9 (222 reviews) | 
  | **Has the product been a good partner in doing business?** | 8.2 (65 reviews) | 8.1 (41 reviews) | 
  | **Product Direction (% positive)** | 8.5 (174 reviews) | 7.7 (303 reviews) | 

---
## Pricing

### Kaspersky Next Optimum

#### Entry-Level Pricing

Plan: Advanced

Price: $77 node/year

Description: Advanced combines Next Generation protection with role-based management and automation for a unique security posture, driving encryption adoption and improving efficiency for businesses of all sizes.


[Browse all 3 editions](https://www.g2.com/products/kaspersky-next-optimum/pricing)

#### Free Trial

Yes

### Thunderbird

#### Entry-Level Pricing

No pricing available

#### Free Trial

No information available

---
## Features Comparison By Category

### Network Sandboxing

| Product | Score | Reviews |
|---|---|---|
| **Kaspersky Next Optimum** | 8.7/10 | 14 |
| **Thunderbird** | N/A | N/A |

#### Sandbox

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Sandbox** | 9.0 (13 reviews) | Not enough data | 

#### Evaluation

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Malware Evaluation** | 9.0 (13 reviews) | Not enough data | 
| **Automatic Submission** | 8.6 (12 reviews) | Not enough data | 
| **Automatic Evaluation** | 8.5 (12 reviews) | Not enough data | 
| **Malware Probability Scores** | 8.6 (12 reviews) | Not enough data | 

### Email Client

| Product | Score | Reviews |
|---|---|---|
| **Kaspersky Next Optimum** | N/A | N/A |
| **Thunderbird** | 8.5/10 | 124 |

#### Inbox Tools

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Unified Inbox** | Not enough data | 8.9 (104 reviews) | 
| **Filters** | Not enough data | 9.0 (110 reviews) | 
| **Reminders** | Not enough data | 8.5 (97 reviews) | 
| **Notifications** | Not enough data | 8.7 (105 reviews) | 

#### Coordination Tools

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Calendar** | Not enough data | 8.5 (94 reviews) | 
| **Contacts** | Not enough data | 8.6 (102 reviews) | 
| **Task Management** | Not enough data | 8.4 (89 reviews) | 

#### Software Options

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Desktop Application** | Not enough data | 9.2 (111 reviews) | 
| **Mobile Application** | Not enough data | 7.6 (65 reviews) | 

#### Email Client - Agentic AI

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Autonomous Task Execution** | Not enough data | Not enough data | 
| **Cross-system Integration** | Not enough data | 8.0 (5 reviews) | 

### Endpoint Protection Platforms

| Product | Score | Reviews |
|---|---|---|
| **Kaspersky Next Optimum** | 8.9/10 | 64 |
| **Thunderbird** | N/A | N/A |

#### Administration

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Compliance** | 9.0 (51 reviews) | Not enough data | 
| **Web Control** | 8.9 (50 reviews) | Not enough data | 
| **Application Control** | 8.9 (51 reviews) | Not enough data | 
| **Asset Management** | 8.9 (48 reviews) | Not enough data | 
| **Device Control** | Feature Not Available | Not enough data | 

#### Functionality

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **System Isolation** | 8.8 (48 reviews) | Not enough data | 
| **Firewall** | 8.8 (48 reviews) | Not enough data | 
| **Endpoint Intelligence** | 8.9 (50 reviews) | Not enough data | 
| **Malware Detection** | 9.1 (52 reviews) | Not enough data | 

#### Analysis

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Automated Remediation** | 8.8 (49 reviews) | Not enough data | 
| **Incident Reports** | 9.0 (49 reviews) | Not enough data | 
| **Behavioral Analysis** | 8.7 (49 reviews) | Not enough data | 

### Email Management

| Product | Score | Reviews |
|---|---|---|
| **Kaspersky Next Optimum** | N/A | N/A |
| **Thunderbird** | 8.9/10 | 10 |

#### Sorting & Filtering

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Attachment Search** | Not enough data | 9.2 (6 reviews) | 
| **Tags** | Not enough data | 9.8 (8 reviews) | 
| **AI Sorting** | Not enough data | 8.0 (5 reviews) | 
| **Predefined Rules** | Not enough data | 9.2 (6 reviews) | 

#### Integrations

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Microsoft Outlook Integration** | Not enough data | 8.3 (6 reviews) | 
| **Gmail Integration** | Not enough data | 9.0 (7 reviews) | 
| **Apple Calendar Integration** | Not enough data | 8.1 (6 reviews) | 

#### Time Management

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Unified Inbox** | Not enough data | 9.4 (6 reviews) | 
| **Email Automation** | Not enough data | 8.8 (7 reviews) | 
| **Snooze** | Not enough data | 9.0 (5 reviews) | 

#### Generative AI

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **AI Text Generation** | Not enough data | Not enough data | 
| **AI Text-to-Speech** | Not enough data | Not enough data | 
| **AI Text Summarization** | Not enough data | Not enough data | 

#### Agentic AI - Email Management

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Autonomous Task Execution** | Not enough data | Not enough data | 
| **Cross-system Integration** | Not enough data | Not enough data | 

### Encryption

| Product | Score | Reviews |
|---|---|---|
| **Kaspersky Next Optimum** | 9.3/10 | 10 |
| **Thunderbird** | N/A | N/A |

#### Encryption

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Email Encryption** | 9.7 (6 reviews) | Not enough data | 
| **Messaging Encryption** | 9.2 (6 reviews) | Not enough data | 
| **File Transfer Encryption** | 9.7 (6 reviews) | Not enough data | 
| **Data Encryption** | 9.5 (7 reviews) | Not enough data | 
| **Document Encryption** | 9.5 (7 reviews) | Not enough data | 
| **Full-Disk Encryption** | 9.8 (7 reviews) | Not enough data | 

#### Compliance

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Authentication** | 8.9 (6 reviews) | Not enough data | 
| **Policy Enforcement** | 9.0 (7 reviews) | Not enough data | 
| **Access Management** | 9.3 (7 reviews) | Not enough data | 

#### Management

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Backup** | 9.4 (6 reviews) | Not enough data | 
| **Recovery** | 9.3 (7 reviews) | Not enough data | 
| **File Management** | 9.0 (7 reviews) | Not enough data | 
| **Anomaly Detection** | 9.0 (7 reviews) | Not enough data | 

### Endpoint Protection

| Product | Score | Reviews |
|---|---|---|
| **Kaspersky Next Optimum** | N/A | N/A |
| **Thunderbird** | N/A | N/A |

#### System Control

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Device Control** | Not enough data | Not enough data | 
| **Web Control** | Not enough data | Not enough data | 
| **Application Control** | Not enough data | Not enough data | 
| **Asset Management** | Not enough data | Not enough data | 
| **System Isolation** | Not enough data | Not enough data | 

#### Vulnerability Prevention

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Endpoint Intelligence** | Not enough data | Not enough data | 
| **Firewall** | Not enough data | Not enough data | 
| **Malware Detection** | Not enough data | Not enough data | 

#### Security Management

| Feature | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Incident Reports** | Not enough data | Not enough data | 
| **Security Validation** | Not enough data | Not enough data | 
| **Compliance ** | Not enough data | Not enough data | 

---
## Categories

**Unique to Kaspersky Next Optimum (3):** [Encryption Software](https://www.g2.com/categories/encryption-software), [Endpoint Protection Platforms](https://www.g2.com/categories/endpoint-protection-platforms), [Network Sandboxing Software](https://www.g2.com/categories/network-sandboxing)

**Unique to Thunderbird (2):** [Email Client Software](https://www.g2.com/categories/email-client), [Email Management Software](https://www.g2.com/categories/email-management)


---
## Reviewer Demographics

### By Company Size

| Segment | Kaspersky Next Optimum | Thunderbird | 
|---|---|---|
| **Small-Business** | 30.7% | 65.2% | 
| **Mid-Market** | 41.1% | 24.3% | 
| **Enterprise** | 28.1% | 10.5% | 

### By Industry

#### Kaspersky Next Optimum

- **Information Technology and Services:** 22.7%
- **Computer Software:** 5.7%
- **Accounting:** 4.6%
- **Financial Services:** 4.6%
- **Computer & Network Security:** 3.6%
- **Internet:** 3.6%
- **Hospital & Health Care:** 3.1%
- **Computer Networking:** 3.1%
- **Telecommunications:** 2.6%
- **Health, Wellness and Fitness:** 2.6%
- **Other:** 43.8%

#### Thunderbird

- **Information Technology and Services:** 12.9%
- **Computer Software:** 11.7%
- **Internet:** 6.6%
- **Marketing and Advertising:** 5.1%
- **Telecommunications:** 3.3%
- **Higher Education:** 2.7%
- **Consumer Goods:** 2.4%
- **Design:** 2.4%
- **Education Management:** 2.1%
- **Renewables & Environment:** 2.1%
- **Other:** 48.6%

---
## Alternatives

### Alternatives to Kaspersky Next Optimum

- [ThreatDown](https://www.g2.com/products/threatdown/reviews) — 4.6/5 stars (1088 reviews)
- [ESET PROTECT](https://www.g2.com/products/eset-protect/reviews) — 4.6/5 stars (1002 reviews)
- [Sophos Endpoint](https://www.g2.com/products/sophos-endpoint/reviews) — 4.7/5 stars (834 reviews)
- [Symantec End-user Endpoint Security](https://www.g2.com/products/symantec-end-user-endpoint-security/reviews) — 4.4/5 stars (553 reviews)
- [Webroot Business Endpoint Protection](https://www.g2.com/products/webroot-business-endpoint-protection/reviews) — 4.5/5 stars (532 reviews)
- [CrowdStrike Falcon Endpoint Protection Platform](https://www.g2.com/products/crowdstrike-falcon-endpoint-protection-platform/reviews) — 4.6/5 stars (440 reviews)
- [Microsoft Defender for Endpoint](https://www.g2.com/products/microsoft-defender-for-endpoint/reviews) — 4.4/5 stars (312 reviews)
- [Check Point Endpoint Security](https://www.g2.com/products/check-point-endpoint-security/reviews) — 4.5/5 stars (284 reviews)
- [FortiClient](https://www.g2.com/products/forticlient/reviews) — 4.4/5 stars (276 reviews)
- [SentinelOne Singularity Endpoint](https://www.g2.com/products/sentinelone-singularity-endpoint/reviews) — 4.7/5 stars (202 reviews)

### Alternatives to Thunderbird

- [Front](https://www.g2.com/products/front/reviews) — 4.7/5 stars (2499 reviews)
- [Spike](https://www.g2.com/products/spike/reviews) — 4.6/5 stars (262 reviews)
- [Mailbird](https://www.g2.com/products/mailbird/reviews) — 3.6/5 stars (101 reviews)
- [BlueMail](https://www.g2.com/products/bluemail/reviews) — 4.3/5 stars (53 reviews)
- [Microsoft Outlook](https://www.g2.com/products/microsoft-outlook/reviews) — 4.5/5 stars (3505 reviews)
- [Shift](https://www.g2.com/products/redbrick-shift/reviews) — 4.5/5 stars (264 reviews)
- [Canary Mail](https://www.g2.com/products/canary-mail/reviews) — 4.5/5 stars (53 reviews)
- [eM Client](https://www.g2.com/products/em-client/reviews) — 4.0/5 stars (61 reviews)
- [Zimbra Desktop](https://www.g2.com/products/zimbra-desktop/reviews) — 4.4/5 stars (22 reviews)
- [Mailspring](https://www.g2.com/products/mailspring/reviews) — 3.8/5 stars (18 reviews)

---
## Top Discussions

### Kaspersky Next Optimum

- Title: [What is endpoint security software?](https://www.g2.com/discussions/kaspersky-endpoint-security-for-business-what-is-endpoint-security-software) — 1 comment
  > **Top comment:** "Endpoint security software is software designed to protect your endpoints, or devices used for daily business operations such as desktop PCs, laptops,..."
- Title: [now Kaspersky Endpoint Security is really heavy for the pc when i do the scan?](https://www.g2.com/discussions/now-kaspersky-endpoint-security-is-really-heavy-for-the-pc-when-i-do-the-scan) — 1 comment, 1 upvote
  > **Top comment:** "It depends on your system specification. You can  check the scan settings and select deep scan once a week when system remain idle"
- Title: [What is the best way to configure kaspersky to achieve the balance, security and performance](https://www.g2.com/discussions/what-is-the-best-way-to-configure-kaspersky-to-achieve-the-balance-security-and-performance) — 1 comment, 1 upvote
  > **Top comment:** "There is no one balance to achieve security and performance.  Your own risk tolerance will determine what level of security you need, and that will have a..."
- Title: [What is the purpose of cloud-based protection?](https://www.g2.com/discussions/cloud-based-protection) — 1 comment, 1 upvote *(includes official response)*
  > **Top comment:** "Most IT security vendors use the cloud to improve protection levels. Hybrid protection (antivirus databases + proactive defense + the cloud) is the most..."
- Title: [What is the ‘cloud’?](https://www.g2.com/discussions/what-is-the-cloud) — 1 comment, 1 upvote *(includes official response)*
  > **Top comment:** "It is a service that runs on a company’s servers rather than on user devices and which can be used over the Internet from anywhere in the world. Examples of..."

### Thunderbird

- Title: [Has anyone managed to use the copy and paste function from excell?](https://www.g2.com/discussions/12306-has-anyone-managed-to-use-the-copy-and-paste-function-from-excell) — 2 comments, 1 upvote
  > **Top comment:** "Strange -- when I do it, the columns and rows are maintained (though some of the formatting is not kept). 

What version are you using? I'm still using..."
- Title: [What is the use of Thunderbird software?](https://www.g2.com/discussions/what-is-the-use-of-thunderbird-software) — 1 comment, 1 upvote
  > **Top comment:** "It allows you to manage multiple emails in a single window without back and forth switching. That's the main use I found. Besides that, it also has a good..."
- Title: [Has anyone managed to use the copy and paste function from excell?](https://www.g2.com/discussions/30110-has-anyone-managed-to-use-the-copy-and-paste-function-from-excell) — 1 comment
  > **Top comment:** "Thunderbird does not recognize Excel’s formatting the way Outlook can. But, it can recognize formatting from Word. Copy paste from Excel to Word, then from..."

---
**Source:** [G2.com](https://www.g2.com) | [Comparison Page](https://www.g2.com/compare/kaspersky-next-optimum-vs-thunderbird)