Microsoft said Thursday that some users were having trouble connecting to their work or school email through Exchange Online, the service that handles mailboxes for Microsoft 365. The company first reported problems in the Americas, then said Microsoft 365 connectivity could be affected in any region. It had given no restoration time in its latest public update.
In an update from Microsoft 365 Status, the company said part of its infrastructure was under heavier load across several regions, which it identified as a likely contributor to the connection errors. Microsoft directed customers to two incident records, EX1550543 and MO1550821. The company had not announced that service was restored as of 10:48 a.m. Pacific time on Nov. 12.
If Outlook will not open your work or school mailbox, check with your organization's help desk before changing your account settings. Microsoft said its first reports involved more than one way of connecting to Exchange Online, so switching from an app to a browser may still leave the mailbox unavailable. Use an alternate contact channel for time-sensitive messages if your organization provides one.
Administrators can look up the incident numbers in Microsoft 365 Service health. Microsoft also offers a public status page for people who cannot reach the admin center.
