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Upgrading to this new release is critical for continued support of add-ins to be installed in Microsoft Outlook in Microsoft Exchange Server 2013. All new add-in manifest files will be signed by using a new RFC3161-based timestamping. This will deprecate the use of SHA1-based timestamping. You will not be able to install or start any new office add-ins until you upgrade to this new version.

How to get this update

To get this update, install the following updates:

Description of the security update for Microsoft Exchange Server 2013: March 8, 2022 (KB5010324) or a later cumulative update for Exchange Server 2013.


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

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