A POP3 account is the alias name of a Microsoft Exchange Server mailbox that supports POP3. For example, the alias for Suzan Fine's mailbox is SuzanF.
Because Microsoft Exchange Server uses Windows NT user accounts for authentication, it may be necessary to specify the mailbox's Windows NT domain and user account and alias name. Note that performance may be improved by including the mailbox's Windows NT domain in the POP3 account name.
Keep the following in mind when you set your POP3 client's account name:
Note If Windows NT Challenge/Response is enabled on the Microsoft Exchange Server computer, Microsoft Internet Mail and News version 3.0 attempts to connect to the Microsoft Exchange Server computer using Windows NT Challenge/Response. It ignores the specified POP3 account. If authentication using this method fails, Internet Mail tries to connect to the Microsoft Exchange Server computer using basic clear text authentication and the specified POP3 account.
With Windows NT Challenge/Response and Internet Mail, it is not possible to specify the name of the Microsoft Exchange Server mailbox you want to access. By default, Microsoft Exchange Server attempts to access the mailbox associated with the Windows NT user account that the user is logged on as. For example, if you are logged on as Domain\Suzanf, with Windows NT Challenge/Response enabled, Microsoft Exchange Server attempts to access the mailbox called Suzanf.