Configuring an application to retrieve messages from an Exchange Server 2003 using POP3, I kept getting failures. I enabled POP3 authentication diagnostic logging and this event started popping (bad pun) up in the application logs.
Event Type : Error
Event Source : POP3SVC
Event Category : Authentication
Event ID : 1011
Description : Authentication attempt fromto User Logon Name has failed with error 0×52e
That event lead me to the following Microsoft KB article which contained the information necessary to resolve the issue.
Users Cannot Log On Using POP3 and the Error 0×80040920 Is Logged
Essentially, it says to use the “DomainName\LogonName\MailboxAlias” format for the user name. It fixed the issue immediately in my case.
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