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Outlook on the Web
Install the Outlook App on Your Computer
Install Outlook Mobile App
Mac Mail and Calendar
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Mac OS 11 (Big Sur) and newer: The Mail and Calendar apps for Mac OS 11 (Big Sur): No action required.
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Mac OS 10.15 (Catalina) and older: Mac OS 10.15 (Catalina) and older are now End-of-Life and no longer supported by Tech Support in response to the discontinuation of security updated to these versions by Apple.
iOS/iPadOS Mail and Calendar Mobile Apps
Android Mail and Calendar Mobile Apps
IMAP/POP Apps
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Email applications using Basic Authentication will stop working. Check with your application's developer for a version that supports Modern Authentication. If an update is not available, use the latest version of Outlook or Outlook on the Web, https://outlook.office.com/mail/
Further Assistance
For troubleshooting assistance, please submit a ticket by selecting an option in the Related Services/Offerings section at right.