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What is happening? Basic Authentication will be disabled for Office 365 mailboxes.
Why is this happening? Basic Authentication is being deprecated by Microsoft. Disabling basic authentication will stop O365 mailboxes from bypassing multi-factor authentication, which will prevent unauthorized logins to mailboxes.
When is this happening? Basic Authentication for Office 365 mailboxes will be disabled on Tuesday, May 25. Please note the disabling process will take approximately one hour to run and the change can take up to 24 hours to take effect.
What is the impact? Some users may experience issues with accessing mailbox features after the change is made on the above date. Most issues can be resolved by removing and re-adding your mail account to the mail client. If you experience persisting issues, please submit a ticket to firstname.lastname@example.org.
Questions or concerns? Please submit to the IST Service Desk, email@example.com.