Is anyone else having trouble with Outlook or Exchange Online? We're seeing inconsistent behavior across users, including delayed or failed email delivery, authentication errors, trouble loading Outlook on the web, and freezing when accessing shared mailboxes. Is this a general service outage, or does it seem limited to certain regions or tenants?
4 Answers
We're seeing messages delayed or rejected with POISONMESSAGE. Some users can send normally, while others can't access Outlook on the web at all. The desktop client works for a few people, but shared-mailbox users are reporting freezes.
Yes, Microsoft has acknowledged an Exchange Online incident (EX1464935). Reported symptoms include delayed or failed messages, authentication problems, mailbox operation errors, and trouble accessing the administration portals. The impact appears uneven across tenants and regions.
It isn't down everywhere. Several organizations in the eastern and western US still have working mail, while others are completely affected. The inconsistent behavior makes it look like a tenant or service-routing issue rather than a universal outage.
There was a noticeable spike in outage reports, and the service provider has confirmed the issue. Teams connection problems may be related, but the confirmed incident is affecting Exchange Online and Outlook functionality.
That matches what we're seeing too—some users are fine while others can't even sign in. Definitely doesn't look like a simple client-side problem.