EXCHANGE

Hi All, Did you notice that the EntraID User Accounts are now disabled when you create Shared Mailboxes in Exchange Online? In April this of Year i saw, that Shared Mailboxes in Exchange Online had disabled Entra Accounts. But it was not consistent in diffrent Tenants and disappeared after a few days. Now i have retested this, and the Entra ID Accounts of Shared Mailboxes are now disabled. I can’t tell when this change was implemented and i didn’t see any Documentation or Information in the Message Center - but it’s possible i’ve overseen that.

Hi All, Microsoft has released the Exchange Server Security Updates yesterday for these Exchange Server Versions: Exchange Server Subscription Edition (SE) Exchange Server 2019 Exchange Server 2016 October 2025 SUs are the last publicly available SUs for Exchange Server 2016 and 2019. From this point forward, only customers who contacted their Microsoft Account Teams to get the Extended Security Update (ESU) for those versions will receive new SUs that we might release for Exchange 2016 and 2019, through April 2026.

Hi All, Until now, for a Hybrid Deployment with Entra Connect Sync or Cloud Sync it was required to have an Exchange Server OnPrem or to use Exchange Recipient Management. A few Weeks ago, Microsoft has published an Article with another Option. Introducing Cloud-Managed Remote Mailboxes: a Step to Last Exchange Server Retirement With the Introducion of the “IsExchangeCloudManaged” Attribute, you can change the source of authority (SOA) from an OnPrem Synced Object for the Exchange Attributes (like Emailaddresses, Alias, HideFromAddressList, ExtensionAttributes) from OnPrem to the Cloud.

Hi All, Microsoft has released the Exchange Server Security Updates yesterday for all currently supported Versions: Exchange Server Subscription Edition (SE) Exchange Server 2019 Exchange Server 2016 Exchange Team Blog Article Released: September 2025 Exchange Server Hotfix Updates Hotfix update for Exchange Server Subscription Edition RTM HU2: September 8, 2025 (KB5066373) Online archiving fails for on-premises users in hybrid environment Issues that this hotfix update fixes: ​​​​​​​Online archiving fails for on-premises users in hybrid environment using the dedicated Hybrid App Exchange Server Subscription Edition In my case, i’ve downloaded the Security Update for Exchange Server Subscription Edition

Hi All, A few hours ago, Microsoft has released the ExchangeOnlineManagement 3.9.0 PowerShell Module. I don’t know what magic they used, but it was not there yesterday. PowerShell Gallery ExchangeOnlineManagement 3.9.0 v3.9.0: Introduce -EnableSearchOnlySession switch in Connect-IPPSSession cmdlet, which enables certain eDiscovery and related cmdlets that connect to other M365 services I am using the new PSResourceGet here instead of the PowerShellGet commands. Show installed Versions and what’s available in PowerShell Gallery.

Hi All, Microsoft has released the Exchange Server Security Updates yesterday for all currently supported Versions: Exchange Server Subscription Edition (SE) Exchange Server 2019 Exchange Server 2016 Exchange Team Blog Article Released: August 2025 Exchange Server Security Updates Exchange Server Subscription Edition In my case, i’ve downloaded the Security Update for Exchange Server Subscription Edition Security Update for Exchange Server Subscription Edition SU1 (KB5063224) Description of the security update for Microsoft Exchange Server Subscription Edition RTM: August 12, 2025 (KB5063224) Installation After the Download i started the *.

Hi All, Just a few days ago, Microsoft has announced that the updated Hybrid configuration Wizard (HCW) now supports the Configuration of the Dedicated Hybrid App. Dedicated Hybrid App: temporary enforcements, new HCW and possible hybrid functionality disruptions CVE-2025-53786 Microsoft Exchange Server Hybrid Deployment Elevation of Privilege Vulnerability Microsoft has also announced some block Tests. As the Adoption of Dedicated Hybrid App does not seem at the Level Microsoft is expecting.

Hi All, A few days ago, Microsoft has released the ExchangeOnlineManagement 3.9.0-Preview1 PowerShell Module. PowerShell Gallery ExchangeOnlineManagement 3.9.0-Preview1 v3.9.0-Preview1: Introduce -EnableSearchOnlySession switch in Connect-IPPSSession cmdlet, which enables certain eDiscovery and related cmdlets that connect to other M365 services I am using the new PSResourceGet here instead of the PowerShellGet commands. Show installed Versions and what’s available in PowerShell Gallery. You need to use the -Prerelease Parameter to show Preview Versions of a Module

Hi All, I’ve found an Issue in my Get-Mailprotection Script and fixed it. The updated Version has been released. PowerShell Gallery Get-Mailprotection 1.17 Release Notes 1.17 Fixed Bug Autodiscover A Record I am using the new PSResourceGet here instead of the PowerShellGet commands. Show installed Versions and what’s available in PowerShell Gallery Get-InstalledPSResource -Name Get-Mailprotection -Scope CurrentUser Find-PSResource -Name Get-Mailprotection Uninstall old Version and install new Version Uninstall-PSResource -Name Get-Mailprotection -Scope CurrentUser Install-PSResource -Name Get-Mailprotection -Scope CurrentUser Get-InstalledPSResource -Name Get-Mailprotection -Scope CurrentUser Use the Script

Hi All, A few days ago, i did publish the Article Installing ADFS on Windows Server 2025. That gave me the opportunity, to test some scenarios with Exchange and Active Directory Federation Services (ADFS). ADFS Server Let’s start the ADFS MMC C:\Windows\ADFS\Microsoft.IdentityServer.msc Create relying party trusts in AD FS for Outlook on the web and the EAC As you can see, the Relying Party Trusts are empty Create Relying Party Trust for Outlook on the Web (owa)