Nico Nico Nii!~
Thing is, some of your Windows software will not work on Windows Server 2008 R2. Even though you'd think it would, since Windows Server 2008 R2 is Windows 6.1 like Windows 7 is, some Windows specific applications will not cooperate on Server 2008, from personal experience.
And I'm afraid you will have to watch out to make sure your PSU doesn't go out. That is one of the most difficult and expensive parts to replace on a laptop. Generally, these do last far longer than a battery, but it's something to think about.