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A widespread Microsoft Outlook outage is affecting millions of users globally. Users report login failures and slow performance. While speculation points to a cyberattack, the cause remains officially unknown. Microsoft acknowledges the issue, impacting Outlook.com, Outlook Mobile, and the desktop client, and states they are working on a fix. A later update confirms Microsoft has identified and deployed a fix, with the issue expected to resolve gradually.

Prepared by Jonathan Pierce and reviewed by editorial team.