Update: The full timeline for retirement of Basic Authentication in Exchange Online is now published in Basic Authentication Deprecation in Exchange Online – September 2022 Update.
Last year we ann...
Updated Sep 01, 2022
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Greg Taylor - EXCHANGE So my understanding is that new O365 customers created after October 2020 will have to use OAuth for IMAP because MS will/could disable Basic Authentication and they will not be able to re-enable it. Which means for SaaS companies that provide integrations to O365, they will have to support OAuth by the original October 2020 deadline if they want to be able to support their customers that might have signed up with O365 after October 2020. Does this sound correct? Moving the deadline to 2021 is really just going to help existing customers that are currently using IMAP but integrators still need to meet the Oct 2020 deadline to ensure our systems work with all O365 customers after that deadline.
Edit: I misread Greg's response. Looks like we are good until 2021. Thanks Greg Taylor - EXCHANGE