Okay, I think I'm set on going for Office 2013. After reading reviews comparing different Office versions, it seems 2013 hits the right notes. E.g. love the fact that MS Word natively supports PDF files as well.

So, searching online (eBay again), I came across this ad:

http://www.ebay.co.uk/itm/OFFICE-PRO...-/222382598145

In it, the seller states:

"YOU WILL GET A BROKEN MOTHERBOARD THAT COMES WITH THE OEM KEY AS REQUIRED TO COMPLY WITH eBAY POLICY."

Would I be foolish to go ahead with the purchase?