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// deadlines · Exchange Online
SMTP AUTH basic authentication off by defaultExchange Online · End of Dec 2026
Microsoft has said end of December 2026 without giving a day. Apps sending mail with a username and password need OAuth or another method.
In short: this takes effect on End of Dec 2026 (Microsoft gives this as an approximate date). That's 56 days from when this page was built.
Time left
Countdown to End of Dec 2026 (UTC).
What to do
- Read the official notice: Microsoft source ↗.
- Add every Microsoft deadline to your calendar: subscribe to the deadlines calendar.
Other upcoming Exchange Online deadlines
Sources