Sublime Security vs Microsoft Defender for Office 365
Side-by-side from the Top 11 ranking of Abnormal Security vs Proofpoint vs Mimecast: 11 Best Email Security Software 2026. Last verified July 4, 2026.
The short answer
Microsoft Defender for Office 365 ranks higher on Top 11 (#4 vs #11) for IT and security leaders. Native M365 protection, included in E5 at $0 extra.
At a glance
| Sublime Security | Microsoft Defender for Office 365 | |
|---|---|---|
| Top 11 rank | #11 / Abnormal Security vs Proofpoint vs Mimecast: 11 Best Email Security Software 2026 | #4 / Abnormal Security vs Proofpoint vs Mimecast: 11 Best Email Security Software 2026 |
| Score (out of 9.4) | — | 8.8 |
| Best for | Best for detection-as-code control | Best native option for Microsoft 365 |
| Pricing | $ (free community tier, paid plans custom) | $ ($2/user/mo Plan 1, $5/user/mo Plan 2, or bundled in E5) |
| HQ | Washington, D.C., USA | Redmond, USA |
| Founded | 2020 | 2015 |
Sublime Security
Open detection-as-code with a real free tier.
sublime.securitySee full entry in Abnormal Security vs Proofpoint vs Mimecast: 11 Best Email Security Software 2026
Microsoft Defender for Office 365
Native M365 protection, included in E5 at $0 extra.
www.microsoft.com/en-us/security/business/siem-and-xdr/microsoft-defender-office-365See full entry in Abnormal Security vs Proofpoint vs Mimecast: 11 Best Email Security Software 2026
Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.