.. if I sold my computer, than I would either need full retail, or OEM? I think I've got what you are saying.
If u would sold your PC with the valid licence, than u would still need to buy...
If u keep the licence, than u can use the upgrade and have "retail licence" PC.
Thanks, I wish Microsoft didn't make EULA's and licensing so confusing.
I am sure, that many people share exactly same opinion : )