Accessing multiple Exchange Mailboxes from Mac Mail

I have two users each of which have a personal account and Exchange mailbox.

Jane Doe with mailbox doejane
John Doe with mailbox doejohn

I third account and mailbox has been created and both Jane Doe and John Doe have been granted full mailbox rights.

Sales with mailbox sales

Jane Doe uses Outlook on a Windows XP machine.  It is quite easy to add additional mailboxes to her Outlook, and it is working well.  John Doe is a Mac OS X user and is using Mac Mail.  He has been using Mac Mail for a number of years and had no difficulty accessing his personal mailbox (doejohn).  However, now we are trying to configure Mac Mail to be able to access the Sales mailbox as well and are not having success.  Has anyone accomplished this, or know how to make it happen?
AppliedScienceAsked:
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strungCommented:
Currently, Mac Mail does not play nice with Exchange server.  If your client has MS Office for Mac, he would be better served using Entourage, which is the Mac equivalent of Outlook:

http://www.entourage.mvps.org/exchange/

The next version of the Mac OS, 10.6, (Snow Leopard) which is expected in September is supposed to have much better Exchange support in Mac Mail.
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