After you install the November 12 security update for Microsoft Exchange Server 2019 and 2016, when you try to export eDiscovery search results to a PST file, the export fails, and you receive the following error message:

Export failed with error type: 'FailedToLoadStatus'

Details: Could not load file or assembly 'Microsoft.Exchange.Diagnostics, Version=, Culture=neutral,  PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.


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

For Exchange Server 2019, install the Cumulative Update 6 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.​

For Exchange Server 2016, install the Cumulative Update 17 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.


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

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