Update

​​​​​​​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
Version: 15.1.2507.59 Link
Receive Important Update Messages Stay tuned for upcoming Microsoft Exchange Server 2016 updates

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