KB5081755: cumulative updates for Exchange Server SE.

Hotfix update for Exchange Server Subscription Edition RTM HU6: May 7, 2026 (KB5081755)

Hotfix Update (HU) 6 for Microsoft Exchange Server SE RTM was released on May 7, 2026. It includes fixes for non-security issues, and might introduce new features. These fixes and features will also be included in a later cumulative updates for Exchange Server SE ​

Issues that this hotfix update fixes

• Microsoft Graph Support for Hybrid Features in Exchange Server SE (May 2026 HU))

Get Hotfix Update for Exchange Server SE RTM HU6
Method 1: Windows Update
This update is available through Windows Update. For more information see Windows Update: FAQ.

Method 2: Microsoft Download Center
You can get the standalone update package through the Microsoft Download Center.

Microsoft Exchange Server SE RTM HU6 - Download the package now

More information
Security update replacement information
This security update replaces the following previously released updates:

Description of the security update for Microsoft Exchange Server Subscription Edition RTM: February 10, 2026 (KB5074992)