Create a new IMAP (not Exchange!) account. In Outlook 2011,enter Outlook>Preferences and go to the Accounts section.Ask your IT administrator or look into your Outlook settings under Windows for the exact URL in your particular case. In DavMail settings, under Main>Gateway>OWA URL, enter the URL you would normally use for Web Access to your Exchange 2003 account.
Just Google “DavMail Mac binary download” to find the nearest/latest available download location. There is a way around this though, using a freely downloadable and open source software called DavMail. But then again, also Apple excluded direct Exchange 2003 support in Mail and iCal on OS/X 10.6 Snow Leopard. Official reason is that Exchange 2003 is too old, which is of course a weak justification considering that even the latest iOS 4.2 for iPhone/iPod and iPad do support Exchange 2003. Unfortunately, Microsoft excluded support for Exchange 2003 in its major upgrade of Office 2011 for Mac.
