The Home and Student editions of Office 2007 allow installation on up to three PCs. However, Office Professional, which is quite a bit more expensive, is vague on how many PCs you are allowed/able to install it on.

My attempts to google for an answer to this question were unsuccessful, so I’m writing this down for the benefit of those following in my footsteps.

I was able to successfully install and activate Office Professional on a second PC (my notebook) without any special steps. The second install reads “non-commercial use” on the title bar but otherwise functions exactly like the first install.