Microsoft Exchange

techcommunity.microsoft.comExchange Online EWS application stopped working? Do this. | Microsoft Community HubThis blog post contains exact steps to temporarily unblock your blocked EWS applications (until April 2027).  

Exchange Online EWS application stopped working? Do this. 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comThe Change Optics Report is now Generally Available in Exchange Online | Microsoft Community HubWe are announcing General Availability of the Change Optics Report in Exchange Online.

The Change Optics Report is now Generally Available in Exchange Online 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comExchange servers may become unstable after installation of October 2026 Windows updates | Microsoft Community HubMore information related to issues that some Exchange servers might experience after installation of October 2026 Windows updates.  

Exchange servers may become unstable after installation of October 2026 Windows updates 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comReleased: October 2026 Exchange Server Security Updates | Microsoft Community HubWe have released October 2026 Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only.  

Released: October 2026 Exchange Server Security Updates 🦋 techcommunity.microsoft.com/blog/Exchang...

techcommunity.microsoft.comSending From Email Aliases – General Availability | Microsoft Community HubWe are announcing General Availability (GA) of Sending from Email Alias in Exchange Online.  

Sending From Email Aliases – General Availability 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comReleased: September 2026 V2 Exchange Server Security Updates | Microsoft Community HubWe have released a V2 of September 2026 Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only.  

Released: September 2026 V2 Exchange Server Security Updates 🦋 techcommunity.microsoft.com/blog/Exchang...

techcommunity.microsoft.comEWS Deprecation Is Here – What This Means To You | Microsoft Community HubEWS deprecation in Exchange Online is starting today. Learn the details of what happens next.  

EWS Deprecation Is Here – What This Means To You 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comAction Required: Upgrade ExchangeOnlineManagement PowerShell Module to Version 3.10.1 or Newer | Microsoft Community HubWe wanted to let you know that you should update your Exchange Online PowerShell module over the next several months.  

Action Required: Upgrade ExchangeOnlineManagement PowerShell Module to Version 3.10.1 or Newer 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comImpact of Exchange Online EWS Deprecation on Hybrid Rich Coexistence and Cross-org Sharing | Microsoft Community HubWe wanted to discuss how upcoming Exchange Online EWS retirement impacts our hybrid customers and cross-org sharing scenarios.  

Impact of Exchange Online EWS Deprecation on Hybrid Rich Coexistence and Cross-org Sharing 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comReleased: September 2026 Exchange Server Security Updates | Microsoft Community HubWe have released Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only.  

8 Sept

Released: September 2026 Exchange Server Security Updates 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comExchange Server AD FS Modern Authentication: Expanded Outlook client support | Microsoft Community HubExpanded Outlook client support for Exchange Server AD FS Modern Authentication is here!  

8 Sept

Exchange Server AD FS Modern Authentication: Expanded Outlook client support🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comTake control of your EWSAllowedAppIDs list before EWS access changes | Microsoft Community HubWe wanted to provide additional guidance on how admins should use the EWSAllowedAppIDs allow list during EWS deprecation.  

4 Sept

Take control of your EWSAllowedAppIDs list before EWS access changes techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comExchange 2016/2019: Throttling and Blocking up to the Final Public Update Baseline | Microsoft Community HubCustomers still using Exchange 2016 or 2019 should read this update about oldest version of Exchange Server allowed to send email to Exchange Online over the...

2 Sept

Exchange 2016/2019: Throttling and Blocking up to the Final Public Update Baseline | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comTell us how you use ObjectGuid, SamAccountName, and DistinguishedName in Exchange Online | Microsoft Community HubWe wanted to ask how you use ObjectGuid, SamAccountName, and DistinguishedName in Exchange Online.  

27 Aug

Tell us how you use ObjectGuid, SamAccountName, and DistinguishedName in Exchange Online | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comHelp us shape Exchange Server on-premises to different online org Free/Busy after EWS retirement | Microsoft Community HubWe wanted feedback about Exchange Server on-premises to different online org Free/Busy sharing, after EWS retirement.  

24 Aug

Help us shape Exchange Server on-premises to different online org Free/Busy after EWS retirement | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comNotes from the field: testing EWSAllowedAppIDs safely | Microsoft Community HubWe wanted to share some tips on how to test EWSAllowedAppIDs (EWS AppID allow list).  

20 Aug

Notes from the field: testing EWSAllowedAppIDs safely | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comUnderstanding the new 100 GB mailbox entitlement for Microsoft 365 Business suites | Microsoft Community HubWe wanted to show Administrators how recent mailbox quota changes for Microsoft 365 Business SKUs will apply to their users.

19 Aug

Understanding the new 100 GB mailbox entitlement for Microsoft 365 Business suites | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comWhere is Exchange SE CU1 anyway? | Microsoft Community HubWe wanted to discuss why we are somewhat late with releasing Exchange SE CU1.  

13 Aug

Where is Exchange SE CU1 anyway? | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comReleased: August 2026 Exchange Server Security Updates | Microsoft Community HubWe have released Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only.  

11 Aug

Released: August 2026 Exchange Server Security Updates | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/Exchang...

techcommunity.microsoft.comCross-tenant Free/Busy, MailTips, and Calendar Sharing are moving to Cross-Tenant Access Policy | Microsoft Community HubWe wanted to provide information related to migration of existing Exchange Online Organization Relationships to the new sharing model.  

7 Aug

Cross-tenant Free/Busy, MailTips, and Calendar Sharing are moving to Cross-Tenant Access Policy | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comWriteback for Cloud-Managed Remote Mailboxes: Now Generally Available | Microsoft Community HubWriteback for cloud-managed remote mailboxes is now Generally Available!  

3 Aug

Writeback for Cloud-Managed Remote Mailboxes: Now Generally Available | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comReminder: Exchange 2016 and 2019 ESU Program Ends in October 2026 | Microsoft Community HubWe wanted to provide a reminder that Exchange 2016 and 2019 ESU program ends in October 2026.  

20 July

Reminder: Exchange 2016 and 2019 ESU Program Ends in October 2026 | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comReleased: July 2026 Exchange Server Security Updates | Microsoft Community HubWe have released Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only.  

14 July

Released: July 2026 Exchange Server Security Updates | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comCross-Tenant Message Recall in Exchange Online | Microsoft Community HubWe wanted to announce cross-tenant Message Recall in Exchange Online!  

10 July

Cross-Tenant Message Recall in Exchange Online | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comUpcoming retirement of OWA Light in Exchange Server | Microsoft Community HubWe wanted to tell you that we will be retiring OWA Light in Exchange Server.  

8 July

Upcoming retirement of OWA Light in Exchange Server | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comIntroducing EWSAllowedAppIDs: Preparing for the Final Phase of EWS Retirement | Microsoft Community HubWe wanted to share details about the EWSAllowedAppIDs, to help you manage retirement of EWS applications in Exchange Online.  

19 June

Introducing EWSAllowedAppIDs: Preparing for the Final Phase of EWS Retirement | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comReleased: June 2026 Exchange Server Security Updates | Microsoft Community HubWe have released Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only.  

9 June

Released: June 2026 Exchange Server Security Updates | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comHow to determine which Resource Mailboxes are being actively used | Microsoft Community HubHere are some tips on how to learn more about resource mailbox use.  

21 May

How to determine which Resource Mailboxes are being actively used | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comReplacing IIS SMTP virtual server with Exchange Edge Transport | Microsoft Community HubHow to go about replacing IIS SMTP virtual server with Exchange Edge Transport.

19 May

Replacing IIS SMTP virtual server with Exchange Edge Transport | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comWriteback for Cloud-Managed Remote Mailboxes: Now in Public Preview | Microsoft Community HubWe are happy to announce public preview of writeback for cloud-managed remote mailboxes!  

15 May

Writeback for Cloud-Managed Remote Mailboxes: Now in Public Preview | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comAddressing Exchange Server May 2026 vulnerability CVE-2026-42897 | Microsoft Community HubWe wanted to tell you how to address the Exchange Server May 2026 vulnerability CVE-2026-42897.  

14 May

Addressing Exchange Server May 2026 vulnerability CVE-2026-42897 | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/Exchang...

techcommunity.microsoft.comNo Exchange Server Security Updates for May 2026 | Microsoft Community HubWe are not releasing any Exchange Server Security Updates for May 2026.  

12 May

No Exchange Server Security Updates for May 2026 | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comRetirement of Direct Exchange ActiveSync Certificate-Based Authentication by End of 2026 | Microsoft Community HubWe are announcing the deprecation of Exchange ActiveSync (EAS) certificate-based authentication (CBA) directly to Exchange Online.  

Retirement of Direct Exchange ActiveSync Certificate-Based Authentication by End of 2026 | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comReleased: May 2026 Exchange Server Hotfix Update | Microsoft Community HubWe have released a Hotfix Update for Exchange Server SE.  

Released: May 2026 Exchange Server Hotfix Update | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comUpdate Your Exchange SE Hybrid On-premises Rich Coexistence to Graph | Microsoft Community HubConfigure Exchange Server SE to move your Hybrid rich coexistence scenarios to Graph API calls.

Update Your Exchange SE Hybrid On-premises Rich Coexistence to Graph | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comGeneral Availability of Mailbox Import and Export Microsoft Graph APIs | Microsoft Community HubAnnouncing General Availability of Mailbox Import and Export Microsoft Graph APIs.  

General Availability of Mailbox Import and Export Microsoft Graph APIs | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comDeprecating Legacy TLS and Endpoints for POP and IMAP in Exchange Online | Microsoft Community HubExchange Online is deprecating old legacy TLS 1.0/1.1 endpoints for POP and IMAP clients.  

27 Apr

Deprecating Legacy TLS and Endpoints for POP and IMAP in Exchange Online | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comtechcommunity.microsoft.com

23 Apr

Modernizing DNS Security for Exchange Online Mail Flow | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comChange Optics Report released into Public Preview to showcase messages impacted by future changes | Microsoft Community HubWe wanted to tell you about a new Change Optics Report that is now in Public Preview.  

20 Apr

Change Optics Report released into Public Preview to showcase messages impacted by future changes | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comAnnouncing Period 2 Exchange 2016/2019 Extended Security Update (ESU) program | Microsoft Community HubWe created a Period 2 ESU for Exchange customers who need extra time to migrate to Exchange SE.  

15 Apr

Announcing Period 2 Exchange 2016/2019 Extended Security Update (ESU) program | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comNo Exchange Server Security Updates for April 2026 | Microsoft Community HubWe are not releasing any Exchange Server Security Updates for April 2026.  

14 Apr

No Exchange Server Security Updates for April 2026 | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/Exchang...

techcommunity.microsoft.comHigh Volume Email reaches General Availability in Exchange Online | Microsoft Community HubHigh Volume Email reached GA!  

31 Mar

High Volume Email reaches General Availability in Exchange Online | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comUpcoming Breaking Changes to Modifying Sensitive Email Properties via Graph API | Microsoft Community HubWe are announcing upcoming changes to what message properties can be changed using Graph API.  

24 Mar

Upcoming Breaking Changes to Modifying Sensitive Email Properties via Graph API | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comCelebrating 30 Years of Microsoft Exchange | Microsoft Community HubExchange Server is 30 years old!  

23 Mar

Celebrating 30 Years of Microsoft Exchange | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comGive Us Feedbaxck on Faster, Simpler Data Purging for Exchange Online | Microsoft Community HubMicrosot Purview team is looking for feedback on Priority Cleanup improvements.  

19 Mar

Give Us Feedbaxck on Faster, Simpler Data Purging for Exchange Online | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comAI‑Powered Troubleshooting for Microsoft Purview Data Lifecycle Management now available | Microsoft Community HubJust a quick note mentioning a release of AI‑powered troubleshooter for Microsoft Purview Data Lifecycle Management.  

16 Mar

AI‑Powered Troubleshooting for Microsoft Purview Data Lifecycle Management now available | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comAnnouncing SMTP DANE & MTA STS Connector Modes in Exchange Online | Microsoft Community HubWe wanted to announce SMTP DANE & MTA STS Connector Modes in Exchange Online.  

10 Mar

Announcing SMTP DANE & MTA STS Connector Modes in Exchange Online | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...

techcommunity.microsoft.comNo Exchange Server Security Updates for March 2026 | Microsoft Community HubWe are not releasing any Exchange Server Security Updates for March 2026.  

10 Mar

No Exchange Server Security Updates for March 2026 | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/Exchang...

techcommunity.microsoft.comNotes From the Field: Finding and Remediating EWS App Usage Before Retirement | Microsoft Community HubWe wanted to share some tips on how to find out details of EWS usage in your tenant.  

23 Feb

Notes From the Field: Finding and Remediating EWS App Usage Before Retirement | Microsoft Community Hub! 🦋 techcommunity.microsoft.com/blog/exchang...