# Bitdefender GravityZone Security for Exchange vs Microsoft Defender for Office 365: side-by-side comparison (2026) [Bitdefender GravityZone Security for Exchange](https://cybersectools.com/tools/bitdefender-gravityzone-security-for-exchange) is a commercial [email security platforms](https://cybersectools.com/categories/email-security-platforms) solution by [Bitdefender](https://cybersectools.com/companies/bitdefender). [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 | | Bitdefender GravityZone Security for Exchange | Microsoft Defender for Office 365 | |---|---|---| | Pricing model | Commercial | Commercial | | Category | Email Security Platforms | Email Security Platforms | | Verified | No | No | | Deployment type | On-Premises | Cloud | | Company size fit | SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise | | Company | Bitdefender | Microsoft | | Headquarters | – | – | ### Use cases and capabilities | | Bitdefender GravityZone Security for Exchange | Microsoft Defender for Office 365 | |---|---|---| | Spam Prevention | Yes | – | | Zero Day | Yes | – | | Microsoft 365 | Yes | Yes | ### Core features **Bitdefender GravityZone Security for Exchange** 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 **Bitdefender GravityZone Security for Exchange** 3 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. - [Bitdefender GravityZone Security for Exchange](https://cybersectools.com/tools/bitdefender-gravityzone-security-for-exchange) fits if you need to run it on your own servers. - [Microsoft Defender for Office 365](https://cybersectools.com/tools/microsoft-defender-for-office-365) fits if you want a cloud product. ## Bitdefender GravityZone Security for Exchange vs Microsoft Defender for Office 365 FAQ Common questions when comparing Bitdefender GravityZone Security for Exchange vs Microsoft Defender for Office 365 for email security platforms. ### What is the difference between Bitdefender GravityZone Security for Exchange and Microsoft Defender for Office 365? **Bitdefender GravityZone Security for Exchange**: Email security for Microsoft Exchange servers with antispam and antimalware. Built by Bitdefender. **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 Bitdefender GravityZone Security for Exchange and Microsoft Defender for Office 365? **Bitdefender GravityZone Security for Exchange** is made by Bitdefender. **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 Bitdefender GravityZone Security for Exchange a good alternative to Microsoft Defender for Office 365? Often, yes. Bitdefender GravityZone Security for Exchange 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 - [Bitdefender GravityZone Security for Exchange vs ID Agent Graphus](https://cybersectools.com/compare/bitdefender-gravityzone-security-for-exchange-vs-id-agent-graphus) - [Bitdefender GravityZone Security for Exchange vs SpamTitan for Office 365](https://cybersectools.com/compare/bitdefender-gravityzone-security-for-exchange-vs-spamtitan-for-office-365) - [Bitdefender GravityZone Security for Exchange vs ESET Cloud Office Security](https://cybersectools.com/compare/bitdefender-gravityzone-security-for-exchange-vs-eset-cloud-office-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 SpamTitan for Office 365](https://cybersectools.com/compare/microsoft-defender-for-office-365-vs-spamtitan-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) ## Alternatives to each - [See all Bitdefender GravityZone Security for Exchange alternatives](https://cybersectools.com/alternatives/bitdefender-gravityzone-security-for-exchange) - [See all Microsoft Defender for Office 365 alternatives](https://cybersectools.com/alternatives/microsoft-defender-for-office-365) --- Source: https://cybersectools.com/compare/bitdefender-gravityzone-security-for-exchange-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/bitdefender-gravityzone-security-for-exchange.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md. More on Bitdefender GravityZone Security for Exchange 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