One of the things I regularly tell my students about are the Virtual Labs pages at Microsoft.com.
You can find it at http://www.microsoft.com/virtuallabs and it enables you to try out a lot of Microsoft’s products for free.
Once you register, you’ll get a lab-description send by e-mail and –for a limited time- access to a Virtual Server to do this lab on.
Recently they added labs for the Microsoft Office 2007 system as well.
You can find them here: click