If you’ve used the Visual Studio 2010 CTP VPC over the last several days, you probably have noticed the warnings about the end of the evaluation period. However, there is a very easy workaround so that you can continue to use the VPC and evaluate this preview of Visual Studio 2010 and the .NET Framework 4.0.
Virtual PC allows you to disable the synchronization between the clock in your virtual machine and the clock on your hardware machine. Once the synchronization is disabled, the clock will only tick forward when the VPC is running. This gives you 2 months of total evaluation time for the VPC.
Jeff Beehler does a great job of describing how to do this in his blog post. Make sure you do this with a newly decompressed VHD image so you can maximize the amount of time you have to evaluate the software.
Also, there are other activation messages that you will run into. Brian Keller has a great blog post describing these messages and what you can do about them.