yup receipt will be provided if requested. You may pm me for the units amount that you need.

Yup free upgrade to windows 10.

Back to Windows 8.1 pro and upgrade again from there to windows 10.

Nope. You may need to use your own original dvd or will provide you a link to download.

It's troublesome and takes up your harddisk space by having windows 7 remnants taking up. Not good if you're having a small hdd on your laptop. But still a lot of people still doing so using the free upgrade method.

windows 10 pro only.

Legal as stated.

No limit and no expiry date. You can use it whenever you want to. Will send you the link to download it if you doesn't have your own original dvd.

Always got stock. Fast dealing, has pmed you.

Yup the sticker only. You can install it with your original dvd if you have it, or will provide you a download link for it.

Receipt will be provided if requested.

win xp long time no produced anymore. It's already year 2016

?? Updating your bios driver doesn't affect the usage of the key.

Yup, this is oem system builder.

Yup got stock for it. How much units you need and deliver to?

The outer part is not a coa. Only the one printed with the product key is the COA.

Yup the design is sort of confusing. But if u notice clearly you can tear the inner part off which is the coa for it. But usually people would just stick the whole sticker to their pc. Has pmed you just now as well.

It depends on end user, nothing to do with the product key.

Yup always available.

Yup the license sticker only. Download link will be provided as well sir. Unless you got your own dvd already then you can use yours with it.