I have to deal with Microshaft more often than i would like too and they simply dont give a "$£"$£"
They also have their OEM and re-seller agreements all sewn up tight so that they dont have to offer any assistance at all. I have had many an argument with them over OEM licensing and product registration and although i know i am going to loose i still have it out with them every time, just to take up someones time and wages for the day.
The long n short, no license no software, the disk its self is simply a media and not the software. These days you get a CD looking box and when you open it its simply a bit of card with a number on and the place where the CD used to be is empty, thety cant even be bothered to ship a disk anymore.
If your lucky you can sometimes pull the cd key from your PC if it was installed previously using an app called "Magic Jelly Bean" which will pull if from your registry.
Sometimes if you have the origional box with the CD key (not the activation key) proof of purchase you can maybe go through the company who sold it to you but to be honest good luck with that too, worked for me the once.
The way microshaft get away with not having to deal with you is the fact that they use "re-sellers" who are responsible for the support of the software so they will simply refer you to your re-seller who will simply forward you back to Mshaft. Its a great scam.
Dont forget too that the copy once installed is tied to that PC/Laptop, loose it or change the Motherboard/processor and you invalidate the OEM agreement, new copy of orafice time.
They then wonder why unscrupulous types easily download it illegally from places like
http://thepiratebay.se/top/301