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As mentioned in the previous blog post, Exchange Online will soon discontinue the use of Exchange legacy tokens as a method that Outlook add-ins can use to authenticate to our service. Outlook add-ins used with Exchange Online will have to use Nested App Authentication (NAA) instead. This impacts Exchange Online only. Details are in the FAQ.

A few days ago, we updated our documentation that now includes a way for tenant administrators to get the list of app IDs that are still requesting (and receiving) Exchange legacy tokens by running the following in Exchange Online PowerShell:

Please see the documentation for full details on how to interpret the results:

Get the status of legacy Exchange Online tokens and add-ins that use them

Nino Bilic