Exchange Server April 2025 Hotfix Update
Hi All,
Yesterday, Microsoft has releasesed the April Hotfix Updates for Exchange Server
Exchange 2019
In my case, i’ve downloaded the Hotfix Update für Exchange Server 2019 CU15
Installation
Update has been sucessfully installed
Healthchecker
Now let’s run the Healthchecker.
The First run updates the Healthchecker to the current version
.\Healthchecker.ps1
Let’s run that again and see the Results.
.\Healthchecker.ps1
Exchange 2016
Note: You should run the Healthchecker afterwards
Dedicated Hybrid App
You need one of these Roles to be able to run the Script:
- Application Administrator
- Global Administrator
.\ConfigureExchangeHybridApplication.ps1 -FullyConfigureExchangeHybridApplication
During the Script you will need to Authenticate
Entra App
Here is the App that was created
The Certificate is valid for 5 Years
It’s the “Microsoft Exchange Server Auth Certificate”
Get-ExchangeCertificate
Permissions: Office 365 Exchange Online > full_access_as_app
The Owner is set to the User that has executed the Script
Testing
The Property “ApplicationIdentifier” of the EvoSts* AuthServer has been set to the AppID of the Entra Application
Get-AuthServer -Identity evosts* | Select-Object IssuerIdentifier, TokenIssuingEndpoint,AuthorizationEndpoint,ApplicationIdentifier,AuthMetadataUrl,DomainName,Realm,Type,Enabled,IsDefaultAuthorizationEndpoint,id, when*
Test OAuthConnectivuty
Test-OAuthConnectivity -Service EWS -TargetUri https://outlook.office365.com/ews/exchange.asmx -Mailbox <OnPremMailbox>
Test in OWA Calendar Availability (free/busy)
Note
I first did test with the Administrator Mailbox as usual. The Mailbox exists OnPrem as you can see.
Get-Mailbox -Identity administrator@icewolf.ch
Get-MailboxStatistics -Identity administrator@icewolf.ch
But the Test-OAuthConnectivity fails
Test-OAuthConnectivity -Service EWS -TargetUri https://outlook.office365.com/ews/exchange.asmx -Mailbox administrator@icewolf.ch -Verbose | fl
and therefore Calendar Availability (free/busy) did not work in OWA either
Regards
Andres Bohren
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