New Microsoft 365 outage causes Exchange Online connectivity issues

Microsoft is investigating ongoing Microsoft 365 issues preventing some Exchange Online customers from accessing their mailboxes.

“We’ve identified an issue affecting Exchange Online connectivity for users in North America and are investigating further,” the company tweeted earlier.

“More details can be found in the Microsoft 365 admin center under EX546390.”

According to outage monitoring platform , thousands of Microsoft 365 report experiencing server connection and login issues, as well as when accessing their Outlook mailboxes.

Some customers  when trying to log into their accounts, while others are  where they’re asked to enter their passwords. 

Microsoft says these Exchange Online connectivity problems only affect North American users.

While the company added that more info on this outage can be in the Microsoft 365 admin center under EX546390, the advisory only says that Microsoft is “looking into a potential problem” and the “potential end-user impact.”

EX546390 M365 admin center advisory
EX546390 M365 admin center advisory ()

Last month,  blocked Exchange Online customers worldwide from accessing their mailboxes and sending or receiving emails.

Yesterday, Microsoft  preventing some users from searching assets across multiple services, including but not limited to Outlook on the Web, Exchange Online, SharePoint Online, Microsoft Teams, and Outlook desktop clients.

 were taken down last week by another outage, blocking customers worldwide from signing into their accounts and seeing their web apps.

 also hit Microsoft 365 in January after router packet forwarding issues within Microsoft’s Wide Area Network (WAN) were inadvertently triggered by a router IP address update.

This is a developing story …