Outlook 2010 keeps prompting for Exchange 2003 server password

i try to connect my outlook 2010 with imap4(exchange 2003). i use VPN and under my exchange account imap ist enable. i also can telnet 143 .

i configure my outllok with imap keeps prompting my exchange password.

please solution
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Larry Struckmeyer MVPCommented:
The best solution is to use Outlook Anywhere instead of imap over VPN.  Next best would be OWA.  What you are doing is very old technology and fraught with issues.

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Shweta GoelCommented:

Please go to ADSI Edit and remove the entry for 2003 box.

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