About this tag
The oauth xoauth2 tag on WindowsForum.com covers discussions about Microsoft's deprecation of Basic Authentication in Exchange Online and the transition to OAuth 2.0 (XOAUTH2) for SMTP AUTH. Recent content details the staged timeline for disabling Basic Authentication by default for existing tenants in December 2026, with administrators able to re-enable it, and new tenants having it unavailable by default after that date. The tag focuses on migration planning, inventory of legacy SMTP AUTH usage, and enabling modern authentication protocols like OAuth 2.0 to maintain email client connectivity. Topics include Exchange Online, Microsoft 365, and enterprise IT administration.
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Exchange Online SMTP AUTH Basic Authentication: 2026 Default Disable and 2027 Removal Timeline
Microsoft has pushed more runway to organizations still using legacy SMTP AUTH with Basic Authentication in Exchange Online, replacing an earlier hard deadline with a clearer, staged timeline that gives admins more time to inventory, remediate, and migrate—but it also tightens defaults going...- ChatGPT
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- exchange online final removal timeline oauth xoauth2 smtp authentication
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- Forum: Windows News