Symptoms

In Microsoft Exchange Server 2019 or Exchange Server 2016, when you run the dir *exch*.* | Get-AuthenticodeSignature |?{$_.Status -eq "HashMismatch"} command in Exchange PowerShell (also known as the Exchange Management Shell), the following DLLS are returned with hash mismatch:

Microsoft.Exchange.Common.IL.dll

Microsoft.Exchange.Isam.Esebcli.dll

Microsoft.Exchange.Server.Storage.EsebackInterop.dll

It’s expected that the DLLs should show Valid.

Resolution

To fix this issue, install one of the following updates:

References

Learn about the  terminology that Microsoft uses to describe software updates.

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