Just using ZCS 8.0.9 as email solution for about 60,000 users, with a big email data of 60 Tb (60,000 users * 1 Tb/user)
Security & performance issues (60,000 user):
- Don't support or guide how to integrate with MFA (Multi-factor Authentication)
- Backup & Recovery for 60 Tb email data is hard (60,000 users * 1 Tb/user); no effective solution for backup & recovery for such a case.
- Don't support DLP (Data Loss Prevention) solution.
- HA (High Availability): just support at the server (VMs) layer, don't support at the service layer.
- It is hard to upgrade ZCS 8.0.9 to ZCS 8.8.15 OSE .