Microsoft Exchange Online outage blocks access to mailboxes worldwide

Userlevel 7
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March 1, 2023 By Sergiu Gatlan


Exchange Online

Microsoft is investigating an ongoing outage blocking Exchange Online customers worldwide from accessing their mailboxes or sending/receiving emails.

Affected users see "550 5.4.1 Recipient address rejected: Access denied" errors when trying to send or when receiving messages, starting today at 1:11 PM UTC.

"We're investigating an issue wherein users may be unable to access their Exchange Online mailboxes via any connection method. Additional details can be found within the Service Health Dashboard under EX522020," Microsoft tweeted earlier today.


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2 replies

Userlevel 7
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Shocking, I say, just shocking. 😀

Actually, quite sad. Sounds like a major hack, or maybe just a router company updating their firmware and blasting the setting all to hell on MSFT’s routers.

AT&T is good at that with their home fiber routers. Every time they update my router, I have to completely reconfigure it. 

Userlevel 7
Badge +5

Saw the effect of this yesterday with issues trying to manage some clients 365 accounts