DNString length mismatch - Exchange - Outlook Web App mailbox policy

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This post describes how to fix the error 'DNString length mismatch'.

Cause

This error can occur when a new Outlook Web App mailbox policy is created in Microsoft Exchange.  I found this issue on Exchange 2016.


The error then occurs when you try to open Outlook Web App policies tab.


Trying to diagnose the issue in PowerShell by running Get-OwaMailboxPolicy also leads to the same error.


Further investigation using ADSI Edit reveals the object causing the error.


Resolution

To resolve the issue, delete the object using ADSI Edit.

The Outlook Web App policies tab now opens again.



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