Microsoft has confirmed that this month's Windows Server security updates are causing OWA sign-in and mail delivery issues on some Exchange Server systems.

Microsoft released an emergency out-of-band update for Windows 11 on March 21, 2026, to resolve widespread sign-in problems affecting Microsoft accounts in apps and services following the March 10 ...

Sign-in problems account for up to 53% of help desk tickets at individual enterprises, but network issues can take significantly longer to resolve, according to a new ControlUp study.

UPDATE: Microsoft has said it's now addressed the issues that caused an Xbox services outage earlier today, bringing players back online. "Great news, everyone! Engineering has confirmed mitigation," ...

Microsoft has released the KB5074105 preview cumulative update for Windows 11 systems, which includes 32 changes, including fixes for sign-in, boot, and activation issues. KB5074105 is an optional ...