Hash mismatch is reported for Exchange DLLs in the bin directory of Exchange Server 2019 and 2016

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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