Accessing Shared Mailboxes in Office365 with PHP
After a lot of trying&failing, this setup worked for me when connecting to a shared mailbox in office365: As the username, use “your_username\shared_mailbox_alias” (your_username needs access to the shared mailbox of course) Add the extended option ‘DISABLE_AUTHENTICATOR’ => ‘PLAIN’ Example: $conn = imap_open( “{outlook.office365.com:993/imap/ssl}Inbox”, ‘[email protected]\shared_mailbox_alias’, ‘mypassword’, OP_READONLY, 1, array(‘DISABLE_AUTHENTICATOR’ => ‘PLAIN’) );