Some older email clients may be using App Passwords as a bridge to authenticate to Exchange Online. People using these email clients will not be affected. The latest versions of Outlook, Apple Mail, Thunderbird, Gmail and Samsung Mail support OAuth. When Basic Authentication is withdrawn in October, users will have to connect to Exchange Online mailboxes with a client that supports what Microsoft calls ‘modern authentication’, which is more generally known as OAuth. This will impact everyone owning or connecting to an Exchange Online personal or shared mailbox: current and retired staff, students and alums. ImpactĪll Exchange Online mailboxes will be affected. It is an approach many IT service/product vendors, including Google, are taking as the industry moves towards making authentication more secure. This will affect how users can connect to their Exchange Online mailboxes. It will start rolling this out across all tenancies starting on 01 October 2022. Microsoft is strengthening its security by withdrawing support for Basic Authentication.

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