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-ERR Protocol Error. 17

I hope someone can help.

I need to have a application collect mail from Exchange 2010 via Pop3, i have followed the instructions at:

http://www.msexchange.org/articles_tutorials/exchange-server-2007/mobility-client-access/using-pop3-imap4-access-exchange-2007-part1.html

But wheneven i telnet to the server i get:

  +OK The Microsoft Exchange POP3 service is ready.
  user support
  -ERR Protocol error. 17

I get the same error no matter what i type in my telnet session.

Does any one know how to solve this?
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This may be the hurdle I fall at...
I have loaded a GoDaddy cert for OWA & OutlookAnywhere reasons, i have assigned the "Post Office Protocol" service.  This certificate is also assigned to the Default Web Site in IIS7.  
I have swapped the certificates arround between all configurations but it still seems to fail.
I have also set Pop3 to Plain Text.
did you restart hte pop3 service after configuring it plain text.
I did, i also did an iisreset.
have you changed the profile that you are using in the outlook express configuration to connect to port 110 with no SSL>!
At the moment I am just using a telnet to localhost 110.
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Via Outlook i get repeatedly asked for a password then when i give up i get:
'10.1.0.5 Receiving' reported error (0x800CCC92) : 'Your e-mail server rejected your login. Verify your user name and password in your account properties. Under Tools, click E-mail accounts.  The Server responded: -ERR Logon failure: unkown user or bad password.
I can confirm the username and password are correct and i have tried both domain\user and just user as the user name.
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