Help accessing pop3 at exchange server 2003

Hi,

I am having problem to access the pop3 at the exchange server in my company remote site using a simple program written in C#. However, I am able to access it through MS Outlook. My program is working fine when I tested it on a gmail account. I was able to get to the “Pop3MailClient Connection State Authorization” but in the end i was getting this message from the pop3 server ‘-ERR Logon failure: unknown user name or bad password.’. I am sure that my userid and password are correct. Can anyone help me on this please….

BTW, the pop3 authentication set in the exchange server is “basic authentication” and “Simple Authentication and Security Layer”.