11:51 AM|||jordan|||
Apparently, when you change the Exchange Alias (User Properties\Exchange General\Alias) to be something other than the user's Windows logon username, it breaks POP3 and IMAP access. You have to change the username in the client to DOMAIN\username\alias.

Q236032
|||109630405818533503|||POP3 and IMAP access for aliased accounts in Exchange