This is using MS Exchange Server 2010. All my users either using OWA, OutlookAnywhere, or POP3. For overseas users, they are using POP3. However, no matter how I tried, change password, this user can't seem to logon successfully, with the following error:
+OK The Microsoft Exchange POP3 service is ready
-ERR Logon failure: unknown usser name or bad password
-ERR Connection is closed.12
What went wrong with user/mailbox, how to resolve?