Okay guys, a serious post...
If you are running an Exchange 2003 server and are replacing any PC's on your network now or in the future. Unless you choose otherwise, you will get supplied with the latest version of Office, 2013.
Obviously, all the business versions get bundled with Outlook 2013. Which you will want to make use of as you have an Exchange server, right?
Here is the serious bit, Outlook 2013 will not work with Exchange 2003. you can fiddle around all you like, but if you configure an Exchange connection, Outlook will crash when you run it.
Saying something along the lines of "Exchange does not allow/support this version of Outlook"
Luckily enough I was able to have spare licence for Microsoft Office home and Business 2010 given to me by my client to use on their new PC.