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Microsoft Outlook servers down, reports say
(www.msn.com)
This is a most excellent place for technology news and articles.
365's OWA, not Outlook. I assume desktop Outlook still works with their Exchange backend because it's just a redirect loop error. They should have it fixed pretty quick.
Desktop Outlook stopped working too, it'd show a send/receive error or "disconnected". Seemed to be resolved around 3:36PM Central.