My first built computer use a full version licenses Windows XP Home disk. I wipe the hard drive and install Linux over 4 1/2 years ago. I have this Windows disk that is just collecting dust. Is it legal to resell my Windows disk with the licenses activation key? And the buyer just have to call Microsoft to get a new activation key right?

Sell or not to sell. That is the question. Or do I have to put this Windows disk in file13?