Michel de Rooij ✅

Re-enabling EWS may give organizations breathing room as MS progresses EWS retirement. Use this time to identify EWS dependencies, engage vendors, and modernize before April 2027. EWS suddenly stopped working in your tenant? This guide explains what to do techcommunity.microsoft.com/blog/exchang...

PSA: Tuesday's Windows Server updates might create issues for Exchange server. A small post which gets updated as info gets disclosed at eightwone.com/2026/10/15/w... #MSExchange

PSA: Today, Period 2 of Extended Security Update (ESU) program for Exchange 2019 & 2016 ends https://xf.ms/Ex20192016ESU2

Happy patch Tuesday everyone! October 2026 Security Updates for Exchange SE/2019/2016 are here. In case of Exchange 2019/2016, it will be their final SU eightwone.com/2026/10/13/s... #MSExchange

PSA: Tomorrow, Period 2 of Extended Security Update (ESU) program for Exchange 2019 & 2016 ends https://xf.ms/Ex20192016ESU2

PSA: In 1 week, Period 2 of Extended Security Update (ESU) program for Exchange 2019 & 2016 ends https://xf.ms/Ex20192016ESU2

PSA: Exchange Server V2 Security Updates for September were published, additionally addressing CVE-2026-96940 eightwone.com/2026/10/03/v... #MSExchange

Another month, another update of the most up-to-date set of books on Microsoft 365 for IT Pros is here with the October 2026 update office365itpros.com/2026/10/01/m... #Microsoft365 #Copilot #SharePoint #MSTeams #MSExchange #MSEntra

PSA: In 3 months, SMTP AUTH w/BasicAuth will be unavailable for new tenants https://xf.ms/SmtpAuthRetire

PSA: Today, EWS block enforced for EXO mailboxes with Kiosk/Frontline SKUs (upd) https://xf.ms/NoEWSEnforced

PSA: Today, Exchange Hybrid requires Hybrid app w/GraphAPI perms https://xf.ms/HybridAppReq

PSA: Today, Exchange Online starts retiring Exchange Web Services (EWS) https://xf.ms/EXORetireEWS

PSA: Tomorrow, Exchange Hybrid requires Hybrid app w/GraphAPI perms https://xf.ms/HybridAppReq

PSA: Tomorrow, EWS block enforced for EXO mailboxes with Kiosk/Frontline SKUs (upd) https://xf.ms/NoEWSEnforced

PSA: Tomorrow, Exchange Online starts retiring Exchange Web Services (EWS) https://xf.ms/EXORetireEWS

PSA: In 3 months, Exchange Online starts retiring SMTP AUTH w/BasicAuth https://xf.ms/SmtpAuthRetire

PSA: In 3 months, SMTP AUTH w/BasicAuth gets disabled for existing tenants, admin can re-enable https://xf.ms/SmtpAuthRetire

Azure Communications Services (ACS) standalone offerings, including bulk/application email, will be retired on September 30, 2028. If you're using ACS today, or planning to adopt it, review the retirement timelines and sign-up deadlines carefully, as some changes take effect soon xf.ms/ACSRetirement

PSA: In 1 week, EWS block enforced for EXO mailboxes with Kiosk/Frontline SKUs (upd) https://xf.ms/NoEWSEnforced

PSA: In 1 week, Exchange Hybrid requires Hybrid app w/GraphAPI perms https://xf.ms/HybridAppReq

PSA: In 1 week, Exchange Online starts retiring Exchange Web Services (EWS) https://xf.ms/EXORetireEWS

PSA: In 1 month, Period 2 of Extended Security Update (ESU) program for Exchange 2019 & 2016 ends https://xf.ms/Ex20192016ESU2

Happy Patch Tuesday: Exchange Security Updates September 2026 (Exchange SE/2019/2016) arrived eightwone.com/2026/09/08/s... #MSExchange

PSA: In 6 months, New Outlook starts opt-out phase https://xf.ms/NewOutlookToggle

PSA: In 1 month, Exchange Hybrid requires Hybrid app w/GraphAPI perms https://xf.ms/HybridAppReq

PSA: In 1 month, EWS block enforced for EXO mailboxes with Kiosk/Frontline SKUs (upd) https://xf.ms/NoEWSEnforced

PSA: In 1 month, Exchange Online starts retiring Exchange Web Services (EWS) https://xf.ms/EXORetireEWS

Running non-Hybrid Exchange on-premises? MS is considering requiring a tenant for Free/Busy collaboration with peers in Exchange Online, driven by Cross-Tenant Access Policies in the post-EWS era. Product Group is looking for feedback techcommunity.microsoft.com/blog/exchang... #MSExchange

The August 2026 update for the #Microsoft365 for IT Pros eBook (well, 4 eBooks in one package) is available for subscribers to download. See office365itpros.com/2026/08/01/m... for more information.

blog: MVPs around the World (2026). Have a look at which categories have grown, which countries lost ground a.o. eightwone.com/2026/08/03/m... #MVPBuzz

PSA: In 3 months, Period 2 of Extended Security Update (ESU) program for Exchange 2019 & 2016 ends https://xf.ms/Ex20192016ESU2

Announcing Microsoft 365 for IT Pros (2027 Edition) office365itpros.com/2026/07/01/microsoft-365-for-it-pros/ #Microsoft365 #MSExchange #Copilot #MSTeams #SharePoint #OneDrive #PowerPlatform #PowerApps #PowerAutomate #AI #Agents #MVPBuzz

PSA: In 3 months, Exchange Hybrid requires Hybrid app w/GraphAPI perms https://xf.ms/HybridAppReq

PSA: In 3 months, EWS block enforced for EXO mailboxes with Kiosk/Frontline SKUs (upd) https://xf.ms/NoEWSEnforced

PSA: In 3 months, Exchange Online starts retiring Exchange Web Services (EWS) https://xf.ms/EXORetireEWS

PSA: In 6 months, Exchange Online starts retiring SMTP AUTH w/BasicAuth https://xf.ms/SmtpAuthRetire

Happy Patch Tuesday: Exchange Security Updates June 2026 (Exchange SE/2019/2016) techcommunity.microsoft.com/blog/exchang... #MSExchange

Want to watch Build 2026 sessions offline? I have updated the Get-EventSession script to add Build support, among some other changes. Check it out at github.com/michelderooi... #MSBuild #Build2026

The June update (#132) for the #Office365 for IT Pros eBook is available for subscribers to download. This is the last update for the 2026 edition. We will publish the 2027 edition next month with some major changes to our content. Read more at office365itpros.com/2026/06/01/o... #Microsoft365

PSA: In 1 month, EWS block enforced for EXO mailboxes with Kiosk/Frontline SKUs https://xf.ms/NoEWSEnforced

For those working with Firefox & using PIM in Entra - just updated the PIMfox, the PIM role activation plug-in to 1.3.0 addons.mozilla.org/en-US/firefo... #Entra #MSEntra

Finally converted Connect-Office365Services to a PowerShell module github.com/michelderooi... - Also available from PSGallery #Microsoft365

blog: Hotfix Update Exchange SE (May2026) & (re)run ConfigureExchangeHybridApplication to enable Graph-based rich coexistence workflows eightwone.com/2026/05/09/h... #MSExchange

The Exchange Deployment and Compliance Tool has been updated to 1.0.0.0; consult the Changelog for changes github.com/michelderooi... For example, EDCA is now available from the PowerShell Gallery www.powershellgallery.com/packages/EDCA #MSExchange #Security #NIS2 #CIS #ANSSI #BSI #CISA #ISM #DISA

So, I vibe-coded a thing: EDCA, your Exchange Deployment & Compliance Assessment tool. Read the blog for more info - preview , feedback much welcomed eightwone.com/2026/04/23/e... #MSExchange #Security

Microsoft announced Period 2 of the Exchange Server 2016/2019 Extended Security Update (ESU) program, which provides continued access to any security updates for legacy on‑premises Exchange environments. While ESUs extend time, orgs cannot avoid the inevitable xf.ms/Ex20192016ESU2 #MSExchange

PSA: Today, Extended Security Update (ESU) period Exchange 2019 & 2016 ends https://xf.ms/Exchange20192016ESU

PSA: Tomorrow, Extended Security Update (ESU) period Exchange 2019 & 2016 ends https://xf.ms/Exchange20192016ESU

We've released the April 2026 update (monthly update #130) for the Office 365 for IT Pros eBook. The Automating #Microsoft365 with #PowerShell eBook (included in the bundle) is also updated. Subscribers, please download! office365itpros.com/2026/04/01/o...

PSA: In 6 months, Exchange Online starts retiring Exchange Web Services (EWS) https://xf.ms/EXORetireEWS