Recently we looked at why someone might choose 365 Advanced Threat Protection vs Mimecasts Spam Protection
A table of some of the added Features Mimecast can give you over Office 365 with ATP
| POLICY | 365 with Advanced Threat Protection | 365 with Mimecast M2A |
|---|---|---|
| Impersontation Protection | ✓ | ✓ |
| Spam Filtering | ✓ | ✓ |
| URL ReWrite / Safelinks | ✓ | ✓ Uses AI to scan webpage for malicous content |
| Archive | ✓ | ✓ 7 second search SLA |
| Email Continuity | ✗ | ✓ ( C1 Product ) |
| Signature Software | ✗ | ✓ |
| Disclaimer Software | ✓ | ✓ |
| DKIM | ✓ | ✓ |
| Attachment sandboxing | ✓ | ✓ ( SLA for Speed ) |
| Safe File Conversion | ✗ | ✓ |
| Email encryption | ✓ | ✓ |
Conclusion
Mimecast adds the following security protection
Safe File conversion ( ability to convert Office and PDF files to a safe file format for immediate delivery to employees )
Email Continuity ( a service so employees can still send and recieve email with Calendar in the case of an office 365 outage )
Mimecast adds the following functionality
Signature software - to Tag signatures on all employee emails
Mimecast had an Outlook add In , so users get notified in real time and can release quarantine items using this instead of waiting for a scheduled Quartine Email ( which cannot be customised like it can be in Mimecast )
There is some talk about 365 Attachment Sandboxing adding 5 minute delays , this really depends on the attachment size etc , however Mimecast have an SLA on this sandboxing unlike 365
I'd also add that Mimecast's Technical support and help is much better than 365!