# ESET Cloud Office Security vs Microsoft Defender for Office 365: side-by-side comparison (2026)

[ESET Cloud Office Security](https://cybersectools.com/tools/eset-cloud-office-security) is a commercial [email security platforms](https://cybersectools.com/categories/email-security-platforms) solution by [ESET](https://cybersectools.com/companies/eset). [Microsoft Defender for Office 365](https://cybersectools.com/tools/microsoft-defender-for-office-365) is a commercial [email security platforms](https://cybersectools.com/categories/email-security-platforms) solution by [Microsoft](https://cybersectools.com/companies/microsoft). Features, integrations, deployment and the company behind each one, side by side.

## Our take

What our shortlists say about the one we picked.

### [Microsoft Defender for Office 365](https://cybersectools.com/tools/microsoft-defender-for-office-365)

Best for: Teams running Microsoft 365

It is on the list because it is built into Microsoft 365, and many companies already own it through their license, so the buying question is often settled before you start. That makes it the natural first layer if you run Microsoft 365. Decide whether it covers your risk alone or needs a second product beside it, since it is built to work with other email security products.

From [Best Email Security Solutions for Business](https://cybersectools.com/shortlists/best-email-security-platforms), Fall 2026.

Reviewed by [Nika (Nikoloz) Kokhreidze](https://cybersectools.com/about).

Need the answer fast? [Best Email Security Solutions for Business](https://cybersectools.com/shortlists/best-email-security-platforms) picks Proofpoint Core Email Protection, Microsoft Defender for Office 365, Mimecast Advanced Email Security and 4 more.

## Side-by-side comparison

| | ESET Cloud Office Security | Microsoft Defender for Office 365 |
|---|---|---|
| Pricing model | Commercial | Commercial |
| Category | Email Security Platforms | Email Security Platforms |
| Verified | No | No |
| Deployment type | Cloud | Cloud |
| Company size fit | SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise |
| Company | ESET | Microsoft |
| Headquarters | – | – |

### Use cases and capabilities

| | ESET Cloud Office Security | Microsoft Defender for Office 365 |
|---|---|---|
| Cloud Native | Yes | – |
| Microsoft 365 | Yes | Yes |
| Ransomware Prevention | Yes | – |
| Sandbox | Yes | – |
| Spam Prevention | Yes | – |

### Core features

**ESET Cloud Office Security**

10 features listed. Sign in on the page to see them.

**Microsoft Defender for Office 365**

10 features listed. Sign in on the page to see them.

### Integrations

**ESET Cloud Office Security**

10 integrations listed. Sign in on the page to see them.

**Microsoft Defender for Office 365**

4 integrations listed. Sign in on the page to see them.

## ESET Cloud Office Security vs Microsoft Defender for Office 365 FAQ

Common questions when comparing ESET Cloud Office Security vs Microsoft Defender for Office 365 for email security platforms.

### What is the difference between ESET Cloud Office Security and Microsoft Defender for Office 365?

**ESET Cloud Office Security**: Cloud email security for Microsoft 365 and Google Workspace applications. Built by ESET.

**Microsoft Defender for Office 365**: Email and collaboration security for Microsoft 365 environments. Built by Microsoft.

The table above shows where their features, integrations, deployment and company size fit differ.

### Who makes ESET Cloud Office Security and Microsoft Defender for Office 365?

**ESET Cloud Office Security** is made by ESET. **Microsoft Defender for Office 365** is made by Microsoft. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is ESET Cloud Office Security a good alternative to Microsoft Defender for Office 365?

Often, yes. ESET Cloud Office Security and Microsoft Defender for Office 365 are both Email Security Platforms products, and both cover Microsoft 365. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [ESET Cloud Office Security vs Iberlayer Email Guardian](https://cybersectools.com/compare/eset-cloud-office-security-vs-iberlayer-email-guardian)
- [ESET Cloud Office Security vs Cybersentriq MX Email Threat Protection](https://cybersectools.com/compare/cybersentriq-mx-email-threat-protection-vs-eset-cloud-office-security)
- [ESET Cloud Office Security vs KnowBe4 Cloud Email Security](https://cybersectools.com/compare/eset-cloud-office-security-vs-knowbe4-cloud-email-security)
- [Microsoft Defender for Office 365 vs Iberlayer Email Guardian](https://cybersectools.com/compare/iberlayer-email-guardian-vs-microsoft-defender-for-office-365)
- [Microsoft Defender for Office 365 vs Cybersentriq MX Email Threat Protection](https://cybersectools.com/compare/cybersentriq-mx-email-threat-protection-vs-microsoft-defender-for-office-365)
- [Microsoft Defender for Office 365 vs KnowBe4 Cloud Email Security](https://cybersectools.com/compare/knowbe4-cloud-email-security-vs-microsoft-defender-for-office-365)

## Alternatives to each

- [See all ESET Cloud Office Security alternatives](https://cybersectools.com/alternatives/eset-cloud-office-security)
- [See all Microsoft Defender for Office 365 alternatives](https://cybersectools.com/alternatives/microsoft-defender-for-office-365)

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Source: https://cybersectools.com/compare/eset-cloud-office-security-vs-microsoft-defender-for-office-365

For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/eset-cloud-office-security.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on ESET Cloud Office Security and Microsoft Defender for Office 365: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=compare-md