Dad left an old (2008) ThinkCentre in my room about 2 years ago. It seems to have an 80GB drive with Windows 7 Ultimate on it.
So tonight, I used KeyFind to copy the license codes for Win7 and Office Pro, and am now doing a clean install with Ubuntu LTS. Time to make some real use of this computer! Not sure what I'll use it for, but I'll find something, I'm sure.