# Microsoft Defender for Office 365 vs Ocean Agentic Email Security Platform: side-by-side comparison (2026) [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). [Ocean Agentic Email Security Platform](https://cybersectools.com/tools/ocean-agentic-email-security-platform) is a commercial [email security platforms](https://cybersectools.com/categories/email-security-platforms) solution by [Ocean Security](https://cybersectools.com/companies/ocean-security). 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 | | Microsoft Defender for Office 365 | Ocean Agentic Email Security Platform | |---|---|---| | 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 | Mid-Market, Enterprise | | Company | Microsoft | Ocean Security | | Headquarters | – | – | ### Use cases and capabilities | | Microsoft Defender for Office 365 | Ocean Agentic Email Security Platform | |---|---|---| | Microsoft 365 | Yes | Yes | | Agentic AI Security | – | Yes | | AI SOC | – | Yes | | Social Engineering | – | Yes | | Triage | – | Yes | | Investigation | – | Yes | | LLM Security | – | Yes | | Spam Prevention | – | Yes | | Generative AI | – | Yes | | Threat Analysis | – | Yes | ### Core features **Microsoft Defender for Office 365** 10 features listed. Sign in on the page to see them. **Ocean Agentic Email Security Platform** 10 features listed. Sign in on the page to see them. ### Integrations **Microsoft Defender for Office 365** 4 integrations listed. Sign in on the page to see them. **Ocean Agentic Email Security Platform** No integrations listed. ## Which one fits you Based on what each listing shows: deployment, company size, price and open source. - [Microsoft Defender for Office 365](https://cybersectools.com/tools/microsoft-defender-for-office-365) fits if you are a small business. ## Microsoft Defender for Office 365 vs Ocean Agentic Email Security Platform FAQ Common questions when comparing Microsoft Defender for Office 365 vs Ocean Agentic Email Security Platform for email security platforms. ### What is the difference between Microsoft Defender for Office 365 and Ocean Agentic Email Security Platform? **Microsoft Defender for Office 365**: Email and collaboration security for Microsoft 365 environments. Built by Microsoft. **Ocean Agentic Email Security Platform**: Agentic AI email security platform that investigates emails pre-delivery. Built by Ocean Security. The table above shows where their features, integrations, deployment and company size fit differ. ### Who makes Microsoft Defender for Office 365 and Ocean Agentic Email Security Platform? **Microsoft Defender for Office 365** is made by Microsoft. **Ocean Agentic Email Security Platform** is made by Ocean Security. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit. ### Is Microsoft Defender for Office 365 a good alternative to Ocean Agentic Email Security Platform? Often, yes. Microsoft Defender for Office 365 and Ocean Agentic Email Security Platform 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 - [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 ESET Cloud Office Security](https://cybersectools.com/compare/eset-cloud-office-security-vs-microsoft-defender-for-office-365) - [Microsoft Defender for Office 365 vs Cisco Secure Email Threat Defense](https://cybersectools.com/compare/cisco-secure-email-threat-defense-vs-microsoft-defender-for-office-365) - [Ocean Agentic Email Security Platform vs ID Agent Graphus](https://cybersectools.com/compare/id-agent-graphus-vs-ocean-agentic-email-security-platform) - [Ocean Agentic Email Security Platform vs ESET Cloud Office Security](https://cybersectools.com/compare/eset-cloud-office-security-vs-ocean-agentic-email-security-platform) - [Ocean Agentic Email Security Platform vs Cisco Secure Email Threat Defense](https://cybersectools.com/compare/cisco-secure-email-threat-defense-vs-ocean-agentic-email-security-platform) ## Alternatives to each - [See all Microsoft Defender for Office 365 alternatives](https://cybersectools.com/alternatives/microsoft-defender-for-office-365) - [See all Ocean Agentic Email Security Platform alternatives](https://cybersectools.com/alternatives/ocean-agentic-email-security-platform) --- Source: https://cybersectools.com/compare/microsoft-defender-for-office-365-vs-ocean-agentic-email-security-platform For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/microsoft-defender-for-office-365.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md. More on Microsoft Defender for Office 365 and Ocean Agentic Email Security Platform: 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