KB5066370: Online archiving fails
Hotfix update for Exchange Server 2016 CU23 HU18: September 8, 2025 (KB5066370)
Hotfix update (HU) 18 for Microsoft Exchange Server 2016 CU23 was released on September 8, 2025. It includes fixes for non-security issues and may introduce new features. These fixes and features will also be included in later cumulative updates for Exchange Server 2016.
Issues that this hotfix update fixes
- Online archiving fails for on-premises users in hybrid environment