Trouble connecting to MS Exchange server with IMAP

I've been trying to setup Apple mail to talk with the Exchange server at work.
I've had no luck after many attempts.
Mac Mini, Intel Core Duo
OS X 10.4.5
Mail 2.0.6
I can connect to the mail server using Safari via Outlook Web Access fine, so my account information must be good...
The sys admin at work, though not Mac savvy, said to use IMAP.
A few other Mac users at work have gotten this to work from their homes with no hassles but non of their suggestions have helped.
The account parameters are:
General Information
Account Type: IMAP
Account Description: IMAP Account
Fill Name: First-name Last-name
Email Address: <user>@<domain>.com
Incoming Mail Server
Incoming Mail Server: mail.<domain>.com
User Name: <windows-domainname>\user
Password: <password>
After this window I click Continue and wait ....
Eventually Mail times out with the message:
The IMAP server mail.<domain>.com is not responding ...
Can someone help ...
Some related questions:
Do I need have the VPN to work established for Mail to work ?
I've tried it both ways and they both fail.
How do I get additional debug/log information out of mail ?
What is the difference between an Exchange account and an IMAP account ?

Try enabling a secure connection to the IMAP-server in account setup (which also should change the port to be used).
Try using the servername found in the WebAccess URL (http://servername/exchange) instead of mail.<domain>.com if it is different.
Try using user@windows-domainname instead of windows-domainname\user.
If this all does not help, be sure to enable your AD-account for IMAP-access. This is a per account configuration. Just installing the IMAP-connector on the Exchange-server does not grant IMAP-access to everybody.

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Hi Csound1, thanks. The email host is 1and1.co.uk, however, i am going to fess up and make myself look like a plonker now -
the email account in question was set up in Outlook as POP - stupid, stupid, stupid me, wasted an afternoon on this! I have now changed the Outlook account to IMAP and Mail.app works perfectly - and looks much nicer than Outlook did. Im in the middle of converting from Windows to a Mac, and still finding my way around the Mac
The lesson learned, never assume - always double check! All my other email addresses with 1and1 are all imap, except this one, and it happened to be the first one I set up in the Mail.app. (bows head in disgrace!)
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Hi Martin,
Thanks for the reply.
Right now I have Apple mail and Outlook installed on my mac laptop and both the applications do not connect to the exchange server. Apple Mail simply does a long process when I give my credentials to create my account and then it gives an error saying it
could not find the server while outlook quickly tells me that either the username or password is incorrect. At the same time I can connect to the server through outlook on my windows computer without any problems whatsoever.
From your reply, I gather that the VIA headers only affect Apple mail and should not affect Outlook app on the mac but right now, neither apps are connecting to the exchange server.
Either way I am trying to find out how to remove the VIA headers because it does not seem that we are using Kemp on the exchange server. Right now I do not have the in depth knowledge that I need because I was not involved in the implementation of our server
system, that was taken care of by a service provider and I was put in charge of mostly simple admin work. Now we are out of contract with the service provider so pretty much everything has fallen onto my shoulders.
If possible, would you mind pointing me in the right direction to finding out if I am using a L7 load balancer and how I would go about removing the VIA headers?

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ORA-06512: at line 35
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Edited by: user1762560 on 26-feb-2009 9.06

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