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TonyRedmond's avatar
Dec 11, 2024

February Deadline Looms for Legacy Exchange Tokens Used by Outlook Add-Ins

A February 2025 deadline looms for Outlook classic add-ins that use legacy Exchange tokens for authentication. Add-ins must switch to nested app authentication (NAA) to have continued access to Exchange mailboxes and other objects. The upgrade is easy enough if the ISV that developed the original add-in is still in business. Things get a lot more complicated when they're not, or you have no idea who developed an add-in.

https://office365itpros.com/2024/12/11/legacy-exchange-tokens-deadline/

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