Mail on iMac not accessing MS Exchange server but both iPhone and iPad access the same account with no problems.

I have been using an iPhone and iPad to access my work emails via our MS Exchange server for a number of years now with no problems at all. I recently replaced my home PC with an iMac (first Mac I have owned) but cannot get it to communicate with the exchange server. I've checked and re-checked the information on the iMac and my iPad - I even deleted the mail account on the iPad and input the details concurrently with setting up on the iMac - but the Mac will not access the exchange server.
I receive the message "The Exchange server "---------------" rejected the password for user "------" Enter you password again or cancel." I am using the correct password. iPad and iPhone are logging on using that password fine. iMac just ends up repeating this message.
Our IT support at work assure me that there is no reason from their end for it not to work, and reasonably point to it working using the iPhone etc.
I'd be extremely grateful if anyone can provide a solution to this basic, but extremely frustrating, little problem.

iPhone and iPad use a different way of accessing the server.
I don't know the exact details, but we are using Zarafa instead of Exchange and have the same problem:
iPhone and the likes can connect to Zarafas z-push interface, which is some identical interface to the native Exchange interface, while the desktop e-mail application tries to interface with the web front end (via http) of the server.
These are completely different setups and it depends on the actual installation of the server to get this going.
So, you will most likely need different access parameters for the desktop - and the web mail feature has to be enabled on the Exchange server.
In my opinion using the web mail interface is just silly. On the other hand, the native protocol has less features comparedto the web front end, so you are somehow stuck with sins of the past.
Good luck!

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