# GLIMPS Email Security for M365 vs Microsoft Defender for Office 365: side-by-side comparison (2026) [GLIMPS Email Security for M365](https://cybersectools.com/tools/glimps-email-security-for-m365) is a commercial [email security platforms](https://cybersectools.com/categories/email-security-platforms) solution by [GLIMPS](https://cybersectools.com/companies/glimps). [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 | | GLIMPS Email Security for M365 | Microsoft Defender for Office 365 | |---|---|---| | Pricing model | Commercial | Commercial | | Category | Email Security Platforms | Email Security Platforms | | Verified | No | No | | Deployment type | Hybrid | Cloud | | Company size fit | SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise | | Company | GLIMPS | Microsoft | | Headquarters | – | – | ### Use cases and capabilities | | GLIMPS Email Security for M365 | Microsoft Defender for Office 365 | |---|---|---| | Zero Day | Yes | – | | DKIM | Yes | – | | DMARC | Yes | – | | Microsoft 365 | Yes | Yes | ### Core features **GLIMPS Email Security for M365** 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 **GLIMPS Email Security for M365** 2 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. ## Which one fits you Based on what each listing shows: deployment, company size, price and open source. - [GLIMPS Email Security for M365](https://cybersectools.com/tools/glimps-email-security-for-m365) fits if you need both cloud and on-premises options. - [Microsoft Defender for Office 365](https://cybersectools.com/tools/microsoft-defender-for-office-365) fits if you want a cloud product. ## GLIMPS Email Security for M365 vs Microsoft Defender for Office 365 FAQ Common questions when comparing GLIMPS Email Security for M365 vs Microsoft Defender for Office 365 for email security platforms. ### What is the difference between GLIMPS Email Security for M365 and Microsoft Defender for Office 365? **GLIMPS Email Security for M365**: AI-based email security for M365 with phishing, BEC & malware detection. Built by GLIMPS. **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 GLIMPS Email Security for M365 and Microsoft Defender for Office 365? **GLIMPS Email Security for M365** is made by GLIMPS. **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 GLIMPS Email Security for M365 a good alternative to Microsoft Defender for Office 365? Often, yes. GLIMPS Email Security for M365 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 - [GLIMPS Email Security for M365 vs ID Agent Graphus](https://cybersectools.com/compare/glimps-email-security-for-m365-vs-id-agent-graphus) - [GLIMPS Email Security for M365 vs Infonaligy Proofpoint Email Security](https://cybersectools.com/compare/glimps-email-security-for-m365-vs-infonaligy-proofpoint-email-security) - [GLIMPS Email Security for M365 vs OPSWAT MetaDefender Email Security](https://cybersectools.com/compare/glimps-email-security-for-m365-vs-opswat-metadefender-email-security) - [Microsoft Defender for Office 365 vs ID Agent Graphus](https://cybersectools.com/compare/id-agent-graphus-vs-microsoft-defender-for-office-365) - [Microsoft Defender for Office 365 vs Infonaligy Proofpoint Email Security](https://cybersectools.com/compare/infonaligy-proofpoint-email-security-vs-microsoft-defender-for-office-365) - [Microsoft Defender for Office 365 vs OPSWAT MetaDefender Email Security](https://cybersectools.com/compare/microsoft-defender-for-office-365-vs-opswat-metadefender-email-security) ## Alternatives to each - [See all GLIMPS Email Security for M365 alternatives](https://cybersectools.com/alternatives/glimps-email-security-for-m365) - [See all Microsoft Defender for Office 365 alternatives](https://cybersectools.com/alternatives/microsoft-defender-for-office-365) --- Source: https://cybersectools.com/compare/glimps-email-security-for-m365-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/glimps-email-security-for-m365.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md. More on GLIMPS Email Security for M365 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