- User 1 is a mailbox user who has Full Mailbox Rights on a shared mailbox that is named Shared1.
- The POP3 protocol is disabled on User 1's mailbox.
- TheShared1 mailbox is hosted on Exchange Server 2007 or Exchange Server 2010.
- A user tries to access the Shared1 mailbox by using User 1's credentials in the form of domain\User1\Shared1.
This issue occurs because Exchange Server validates the POP3 protocol if the POP3 protocol is enabled or disabled.
Note This issue does not occur in Microsoft Exchange Server 2003 and earlier Exchange Server versions.
Article ID: 949926 - Last Review: Sep 12, 2012 - Revision: 1