Several thousand users reported problems with Outlook on Thursday morning, as Microsoft acknowledged that users might have issues accessing their mailbox.
More than 2,700 users were reporting problems as of 11:45 a.m. EDT, with issues initially emerging Wednesday night, according to Downdetector.
Microsoft said early Thursday morning that it had determined the cause of the problem and was deploying a fix.
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The tech giant noted on its service health page that it expected the fix to take an “extended period,” although a later update suggested it was “progressing quicker than anticipated.”
“We're continuing to apply the configuration changes to fix the underlying problem and completing additional validation efforts to ensure authentication components are properly configured,” Microsoft said in its most recent update.
“In parallel to the current deployment of the configuration change fix, we're reviewing options to leverage an expedited deployment methodology in regions which are experiencing the highest levels of impact to provide the most effective relief where possible,” it added.