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Microsoft Outlook experienced a global service disruption on Monday, with millions of users reporting they were unable to log in and access their email. According to CNET, Microsoft has confirmed the issue is now resolved, though some users may need to re-log in to restore full functionality.
The outage affected multiple Outlook platforms, including the web version, desktop client, and mobile apps. Users received error messages when attempting to sign in, and some were unable to access their email accounts altogether. According to Microsoft’s official status page, the company launched an investigation immediately after detecting an “unexpected increase in email login errors.”
According to Mashable, the disruption drew widespread attention globally, with large numbers of users reporting inability to access Outlook services on social media. Enterprise users were particularly affected, as Outlook is a core tool for daily communication and collaboration in many organizations.
Microsoft confirmed in a subsequent statement that the root cause of the disruption had been resolved. The company stated: “We have fixed the issue affecting Outlook sign-in, and services are fully recovering.” However, Microsoft recommended that some users manually sign out and sign back in to ensure their accounts are fully restored.
This is one of several Microsoft 365 service disruptions in 2026. Microsoft Teams and OneDrive have previously experienced similar global outages. Microsoft has stated it is investing in improving its infrastructure reliability to reduce the frequency of such incidents.
Cybersecurity experts note that while large-scale service disruptions like this are typically technical issues rather than security events, they serve as a reminder for both enterprises and individual users to maintain backup communication channels for when critical services become unavailable.