Microsoft's online virtual lab

    Microsoft has created many training environments for applications like RMS, SPS, SMS, LCS, Exchange and so on, through this you can take a quick tour of these applications even though you have not installed these products on your local server. After registration, you will connect to the Microsoft's virtual machine by using a web-based version of the Remote Desktop system, then you can do any operation on it just like on your local machine, it's really pretty cool.

    Check it out:
    http://microsoft.demoservers.com/