Windows 10: Question about windows 10 license on laptop

I have a lenovo laptop that come with windows 10 home. I'm planning to upgrade it into windows 10 pro. From my understanding, I just need to buy a key and "change the product key" right ? What happen to the old key that came with the laptop then ? And do I lose all data ?

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Windows 10 upgrade license

The interesting question is that: the upgrade takes place before 29 of July. If I upgrade the PC (change the MB), and I transfer the Win 8.1 license to this new PC (cause 8.1 is retail FPP), will I be able to upgrade to Windows 10 for free? Or a upgrade license must be bought?

 

Windows 7 license question

Hi. Is it possible to take a Windows 7 Pro license that's currently installed on a Dell laptop and move that to a Dell desktop and take the Windows 7 Home license from the Dell desktop and install that on the laptop? I would just be switching the licenses from one to another. I get conflicting answers. The desktop would have a new hard drive installed on it and more RAM. I would be doing a fresh install on BOTH machines using a legitimate bloat free Windows disk. Thanks!

 

Windows 10 upgrade license

Hello guys,

I have 1 license of WIndows 8.1 FPP/retail license. I want to upgrade to WIndows 10, but I one thing is unclear to me.
If I upgrade, will WIndows 10 license be retail or it will "turn" into some sort of OEM license?

I ask this because I upgrade my PC, you know, more memory, replace HDD, and I intend to upgrade the MB and CPU to Kaby Lake platform sometime in the future, (and of course sell the replaced hardware)
This thing is not clearly mentioned anywhere.

Thank you.