PDA can not connect to Exchange 2003 Using Pop 3

Exchange organization has 4 back-end exchange servers and 1 front-end server.  From the internet clients access front end server via an ISA server.  Using outlook express clients can successfully connect to the front end server using POP3.  When a client fails to connect when using a PDA provided by Sprint Model PPC6700. The error code is 0x274d.  Just want to make clear. Outlook express connects properly, which I infer that the ISA and Exchange server is setup properly to use POP3.  It is just this PDA which returns the error.

I have not been able to find anything about this error on the microsoft support site or by google.
Event Type:      Error
Event Source:      POP3SVC
Event Category:      Connections
Event ID:      1016
Date:            11/1/2006
Time:            5:55:30 PM
User:            N/A
Computer:       MYOWASERVR
Description:
POP3 proxy connection to iri-epicordb.ici.interstate.grp for icidom/myuser (mailbox MyUser) failed with error 0x274d.

For more information, click http://www.microsoft.com/contentredirect.asp.
Data:
0000: 46 01 45 00               F.E.    
hillchAsked:
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LeeDerbyshireConnect With a Mentor Commented:
Not sure if this will help, but with some POP clients you will need to enter the username as DOMAIN\USERNAME\MAILBOXALIAS .  Username is the domain account name, and alias is the Mailbox Alias shown in Active Directory Users and Computers.
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hillchAuthor Commented:
Resolved.
POP3 Protocol was not enabled on the particular back-end server to which the client conects.  POP3 worked after enabling the protocol.  The problem was masked because the other tests were do a different back-end server which had POP3 enabled.

Thanks for your suggestion, which did resolve a different issue I was having. So unknowningly you helped me with another issue, so you get the points anyway.
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