Exchange

October 2026

• Thu 8 Oct New and changed features Product news · Sending From Email Aliases – General Availability
• Sat 3 Oct Retirements and dates Product news · EWS Deprecation Is Here – What This Means To You
• Sat 3 Oct New and changed features Product news · Notes from the field: testing EWSAllowedAppIDs safely
• Fri 2 Oct New and changed features Product news · Released: September 2026 V2 Exchange Server Security Updates
• Fri 2 Oct Install and upgrade New version · Exchange Server 2016 · Build: 15.1.2507.75 (CU23 Sep26SUv2)
• Fri 2 Oct Install and upgrade New version · Exchange Server 2019 · Build: 15.2.1544.48 (CU14 Sep26SUv2)
• Fri 2 Oct Install and upgrade New version · Exchange Server 2019 · Build: 15.2.1748.53 (CU15 Sep26SUv2)
• Fri 2 Oct Install and upgrade New version · Exchange Server SE · Build: 15.2.2562.53 (RTM Sep26SUv2)
• Thu 1 Oct Install and upgrade Product news · Action Required: Upgrade ExchangeOnlineManagement PowerShell Module to Version 3.10.1 or Newer

September 2026

• Wed 30 Sep Retirements and dates Product news · Impact of Exchange Online EWS Deprecation on Hybrid Rich Coexistence and Cross-org Sharing
• Tue 29 Sep New and changed features Product news · Cross-tenant Free/Busy, MailTips, and Calendar Sharing are moving to Cross-Tenant Access Policy
• Tue 29 Sep New and changed features Roadmap entry · Microsoft 365: Change Meeting Organizer via PowerShell Cmdlet in Exchange Online
• Thu 24 Sep New and changed features Product news · Released: September 2026 Exchange Server Security Updates
• Tue 22 Sep Retirements and dates Product news · Introducing EWSAllowedAppIDs: Preparing for the Final Phase of EWS Retirement
• Tue 15 Sep New and changed features Product news · Cross-Tenant Message Recall in Exchange Online
• Mon 14 Sep New and changed features Roadmap entry · Microsoft 365: Introducing Exchange Online Cross-tenant Message Recall
• Tue 8 Sep New and changed features Product news · Exchange Server AD FS Modern Authentication: Expanded Outlook client support
• Tue 8 Sep New and changed features Product news · Released: August 2026 Exchange Server Security Updates
• Tue 8 Sep Install and upgrade New version · Exchange Server 2016 · Build: 15.1.2507.73 (CU23 Sep26SU)
• Tue 8 Sep Install and upgrade New version · Exchange Server 2019 · Build: 15.2.1544.46 (CU14 Sep26SU)
• Tue 8 Sep Install and upgrade New version · Exchange Server 2019 · Build: 15.2.1748.51 (CU15 Sep26SU)
• Tue 8 Sep Install and upgrade New version · Exchange Server SE · Build: 15.2.2562.49 (RTM Sep26SU)
• Fri 4 Sep New and changed features Product news · Take control of your EWSAllowedAppIDs list before EWS access changes
• Wed 2 Sep New and changed features Product news · Exchange 2016/2019: Throttling and Blocking up to the Final Public Update Baseline
• Wed 2 Sep New and changed features Product news · Tell us how you use ObjectGuid, SamAccountName, and DistinguishedName in Exchange Online

August 2026

• Mon 24 Aug Retirements and dates Product news · Help us shape Exchange Server on-premises to different online org Free/Busy after EWS retirement
• Wed 19 Aug New and changed features Product news · Understanding the new 100 GB mailbox entitlement for Microsoft 365 Business suites
• Fri 14 Aug New and changed features Product news · Reminder: Exchange 2016 and 2019 ESU Program Ends in October 2026
• Thu 13 Aug Retirements and dates Product news · Upcoming retirement of OWA Light in Exchange Server
• Thu 13 Aug New and changed features Product news · Where is Exchange SE CU1 anyway?
• Tue 11 Aug Install and upgrade New version · Exchange Server 2016 · Build: 15.1.2507.72 (CU23 Aug26SU)
• Tue 11 Aug Install and upgrade New version · Exchange Server 2019 · Build: 15.2.1544.44 (CU14 Aug26SU)
• Tue 11 Aug Install and upgrade New version · Exchange Server 2019 · Build: 15.2.1748.49 (CU15 Aug26SU)
• Tue 11 Aug Install and upgrade New version · Exchange Server SE · Build: 15.2.2562.46 (RTM Aug26SU)
• Mon 3 Aug New and changed features Product news · Writeback for Cloud-Managed Remote Mailboxes: Now Generally Available

July 2026

• Fri 24 Jul New and changed features Product news · Released: July 2026 Exchange Server Security Updates
• Wed 15 Jul New and changed features Roadmap entry · Outlook: Emails marked with External to be supported as Rules conditions
• Tue 14 Jul New and changed features Product news · Released: June 2026 Exchange Server Security Updates
• Tue 14 Jul Install and upgrade New version · Exchange Server 2016 · Build: 15.1.2507.71 (CU23 Jul26SU)
• Tue 14 Jul Install and upgrade New version · Exchange Server 2019 · Build: 15.2.1544.43 (CU14 Jul26SU)
• Tue 14 Jul Install and upgrade New version · Exchange Server 2019 · Build: 15.2.1748.48 (CU15 Jul26SU)
• Tue 14 Jul Install and upgrade New version · Exchange Server SE · Build: 15.2.2562.45 (RTM Jul26SU)
• Jul 2026 New and changed features Product news · In preview: Exchange Online DLP policies can detect classification failures caused by timeouts, throttling, and other scanning errors.

June 2026

• Fri 26 Jun New and changed features Product news · How to determine which Resource Mailboxes are being actively used
• Wed 10 Jun Issues and security Security news · New Exchange Online Mailbox Auditing Signal: Visibility into IPM to Non-IPM Copy Activity
• Tue 9 Jun Install and upgrade New version · Exchange Server 2016 · Build: 15.1.2507.69 (CU23 Jun26SU)
• Tue 9 Jun Install and upgrade New version · Exchange Server SE · Build: 15.2.2562.43 (RTM Jun26SU)
• Fri 5 Jun New and changed features Roadmap entry · Exchange: Dynamic distribution groups now populate membership faster on creation and modification

May 2026

• Tue 19 May New and changed features Product news · Replacing IIS SMTP virtual server with Exchange Edge Transport
• Thu 7 May Install and upgrade New version · Exchange Server SE · Build: 15.2.2562.41 (RTM May26HU)

April 2026

• Mon 20 Apr New and changed features Product news · Priority Cleanup V2: Faster, Simpler Data Purging for Exchange Online
• Mon 20 Apr New and changed features Roadmap entry · Exchange: High Volume Email for Microsoft 365
• Wed 15 Apr New and changed features Roadmap entry · Microsoft 365: Information Barriers (IB) upgrading from IB v1 to IB v2 with new capabilities
• Mon 13 Apr Issues and security Added to CISA KEV · Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability

March 2026

• Mon 16 Mar New and changed features Roadmap entry · Exchange: Exchange Online Moderation approval requests via Actionable Messages

February 2026

• Tue 10 Feb Install and upgrade New version · Exchange Server 2016 · Build: 15.1.2507.66 (CU23 Feb26SU)
• Tue 10 Feb Install and upgrade New version · Exchange Server SE · Build: 15.2.2562.37 (RTM Feb26SU)

January 2026

• Wed 14 Jan New and changed features Roadmap entry · Microsoft 365: Multi-Geo In-Region Routing

December 2025

• Fri 19 Dec New and changed features Roadmap entry · Microsoft 365: SMTP onboarding to App Role Based Access Control
• Fri 19 Dec New and changed features Roadmap entry · Exchange: Message Trace - Custom Retention
• Tue 9 Dec Install and upgrade New version · Exchange Server 2016 · Build: 15.1.2507.63 (CU23 Dec25SU)
• Tue 9 Dec Install and upgrade New version · Exchange Server SE · Build: 15.2.2562.35 (RTM Dec25SU)

October 2025

• Tue 14 Oct Install and upgrade New version · Exchange Server 2016 · Build: 15.1.2507.61 (CU23 Oct25SU)

Sorted from how each source classifies its records: what's-new pages, releases, documentation changes, notices, roadmap items, and network changes. A kind is a reading aid, not Microsoft's own category.