| Release Date |
October 2015 |
October 2018 |
| Operating System Support |
Windows Server 2012 R2, Windows Server 2016 |
Windows Server 2019, Windows Server 2022 |
| Database Availability Groups (DAG) |
Supports up to 16 copies of each mailbox database. |
Improved performance and security with support for up to 16 copies of each mailbox database. |
| Mailbox Server Role |
Combined Mailbox and Client Access server roles in a single role. |
Continues with the combined server role, with optimizations for better performance and scalability. |
| Storage Improvements |
Supports traditional hard drives with reduced storage IOPS. |
Supports larger disks, SSDs, and optimized performance with reduced storage IOPS and better use of modern hardware. |
| Security Features |
Built-in DLP and basic anti-malware protection. |
Enhanced security features, including support for Windows Server Core, TLS 1.2, and improved DLP. |
| Unified Messaging (UM) |
Unified Messaging capabilities integrated within Exchange. |
Unified Messaging removed; customers are encouraged to use third-party solutions. |
| Client Support |
Supports Outlook 2010, 2013, and 2016. |
Supports Outlook 2013, 2016, 2019, and Outlook for Office 365. |
| Performance and Scalability |
Optimized for large enterprises with substantial user bases. |
Enhanced performance with modern hardware, SSD support, and improved search architecture. |
| Hybrid Cloud Support |
Supports hybrid deployments with Office 365. |
Improved hybrid deployment capabilities with easier integration with Office 365 and Azure. |
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