Exchange 2013/2016 IMAP/EWS and service accounts

 

You might have an LOB application at your company that uses IMAP to pull data from specific mailboxes. In order to access those mailboxes you don’t need necessarily to have a mail-enabled user or a mailbox assigned to the account. In general it was enough to grant FullAccess on the shared mailboxes to the account, which might be a service account.

Well, it was sufficient. This changed with Exchange 2013/2016.

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