MSExchange.org Article: Managing Exchange Server 2007 using a Windows XP workstation
I have written an article explaining how to install the Exchange Server 2007 Management tools in a workstation running Windows XP in the MSExchange.org website.
Check it out: http://www.msexchange.org/articles_tutorials/exchange-server-2007/management-administration/managing-exchange-server-2007-using-windows-xp-workstation.html
Ps.: The last part of the article I show how to install the ExchangeUMTestPhone.