By Sergiu Gatlan
Publication Date: 2026-03-23 12:17:00
Microsoft is working to address an ongoing service issue that has intermittently prevented some users from accessing their cloud-based Exchange Online mailboxes via Outlook mobile and Mac desktop clients since Thursday.
After investigating the incident (tracked under EX1256020), Microsoft found that the root cause was a newly introduced virtual account.
On Saturday, began working to revert the change as a possible long-term solution to mitigate the impact, after failing to address the problem by restarting the affected infrastructure.
“This issue may intermittently impact some users who are attempting to access the Exchange Online service through the Outlook mobile apps or the new Outlook for Mac desktop client,” Microsoft said.
“After further assessment, we’ve confirmed that the identified change within the Exchange Online service intended to introduce a new virtual account resulted in impact. To remediate this issue, we’re disabling the change across the affected…