Microsoft Exchange

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

“We have 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 the failure monitoring platform Descent detectorThousands of Microsoft 365s are reporting issues signing in and connecting to the server, as well as accessing their Outlook mailboxes.

Some customers see errors trying to log into their accounts, while others are caught in a connection loop where they are prompted to enter their passwords.

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

While the company added that more information about this outage can be found in the Microsoft 365 admin center under EX546390, the advisory only states that Microsoft is “investigating a potential issue” and “the potential impact to the final user “.

EX546390 M365 Admin Center Board
EX546390 M365 admin center notice (Reddit)

Last month, another breakdown prevented Exchange Online customers around the world from accessing their mailboxes and sending or receiving email.

Yesterday Microsoft fixed more Microsoft 365 issues preventing some users from searching for assets across multiple services, including but not limited to Outlook on the web, Exchange Online, SharePoint Online, Microsoft Teams, and Outlook desktop clients.

Several Microsoft 365 services were taken down last week by another outage, preventing customers around the world from logging into their accounts and seeing their web applications.

A massive breakdown also hit Microsoft 365 in January after router packet forwarding issues within Microsoft’s wide area network (WAN) were inadvertently triggered by an update to the router’s IP address.

This is a developing story…


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