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Exchange Server Subscription Edition RTM Exchange Server Subscription Edition RTM Hotfix update

KB5081755

KB5081755: Hotfix update for Exchange Server Subscription Edition RTM, May 2026. Microsoft Graph adds hybrid free/busy and profile sharing

In short

Exchange Server SE RTM gains Microsoft Graph support for hybrid free/busy and profile picture sharing, plus partial MailTips support. The change replaces EWS in most hybrid scenarios ahead of its scheduled retirement from Exchange Online in October 2026.

Does it affect you? Applies to: Organizations running Exchange Server Subscription Edition RTM in hybrid deployments.

Build
15.2.2562.41
Servicing branch
RTM

What changes

New feature 1 change

Microsoft Graph

For: Exchange Server SE hybrid administrators

  • Hybrid deployments can use Microsoft Graph for free/busy information and profile picture sharing, and for MailTips in some cases.1
    This replaces Exchange Web Services (EWS) for most hybrid scenarios.

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2026-05-07
Classification
Updates
Type
Cumulative update
Servicing branch
RTM
Replaces
KB5074992, KB5071876
Replaced by
KB5094139
VersionBuildChannel
SE 15.2.2562.41 General availability

Security

No vulnerabilities are listed for this update.

Updated components

1,342 files changed since the previous update for the same versions.

Top changed componentsFiles
Management and PowerShell128
Transport93
Client access (POP, IMAP, ActiveSync)33
Mailbox replication33
Search27
Compliance and eDiscovery25
Exchange Web Services and Autodiscover17
Outlook on the web8
Setup8

Sources

Updated
Cited passages from Microsoft's official notes (1)
  1. 1. Exchange Server supports the use of the Microsoft Graph API in hybrid deployments for free/busy information, profile picture sharing and for MailTips (partially). support.microsoft.com
Checked automatically: 8 of 8 checks passed, 1 quoted passage · compared with Microsoft's page on Sep 26, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 5/5, clarity 5/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake