Zammer, welcome to Laptop GPS World. This website is only as "awesome" as the members make it .
The first day I received my S&T 2008 I installed it on my home desktop and also on my mobile computer. Both installations were successfully activated the same day.
Later I needed to re-install my Windows XP mobile PC to Windows Vista operating system. I actually added a new hard drive to my existing PC for this purpose. To activate I needed to phone the technical support, because new hardware was involved. My installation was activated manually with the tech person on the phone. I was told that if I hadn't added any new hardware, if I only reformatted and re-installed OS and S&T, even the on-line activation would activate it successfully without me having to phone them.
I overheard someone say MS was considering adding a feature into the activation application to allow users to "return" an activation key to the server, so S&T can be uninstalled from one PC and later installed on another PC, if ever such need arises.