Microsoft 365 and Outlook outage hits users in the Americas and Switzerland

Microsoft 365 and Outlook experienced a global outage on Thursday evening, affecting users in North and South America and Switzerland, with Microsoft citing "increased load" on its infrastructure. Microsoft reported investigating user issues accessing Exchange Online mailboxes via various connection methods, noting the business version of the applications appears affected. Over 50 users in Switzerland reported Microsoft 365 problems, and nearly 100 reported Outlook issues on allestörungen.ch. Microsoft stated the increased load in multiple regions likely contributed to connection errors, potentially indicating a DDoS cyberattack, though this remains unconfirmed. The company worked to minimize impact, and the issue appeared resolved shortly before 8 p.m.