using 1 windows license for multiple installaions

I have an original windows 7 license.   I have the OS installed on my desktop PC and want to install it on a mac, to dual boot as well into windows.  Can I use my license on both devices?  I want to upgrade to win 10, can I likewise use that one license for both machines using win10?  I have never tried that before, so just double checking so I don't waste my time if it's not going to validate the license.
DanNetwork EngineerAsked:
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
Note that OS that come installed on the computer is OEM which means that OS lives and dies with the hardware and is not transferable to another device.  If you have bought a retail copy (i.e. shrink wrapped copy from a store) or you have an Open or Enterprise license, it allows for transfer to another device, however, you are entitled to have the license installed on one computer at a time (it doesn't matter if it is powered on or not, you are allowed to have the software installed on one device).  In your case, you are required to buy a second copy of Windows to install it on your Mac.  Same applies for Windows 10.

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DanNetwork EngineerAuthor Commented:
That OEM rule ("lives and dies with the hardware") is not applicable anywhere, for example in most (all?) EU countries it does not hold true.

Anyway, you need a license for each installation you plan to use separately. Means, you can only use the same license key on another system if you abandon (delete) the system you took it from.
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DanNetwork EngineerAuthor Commented:
So if I had a license for a different hardware and I'm not using it anymore on that computer I can transfer the license to a new computer correct?
If you are EU based, this is allowed (in most/all? countries), yes.
☠ MASQ ☠Commented:
That OEM rule ("lives and dies with the hardware") is not applicable anywhere*

I think you meant *everywhere(?)  :)

EU is currently the only part of the world where there is actual legislation which prevents Microsoft binding the licence to the machine it was provided with.  It is regarded as "restrictive practice".

What you were asking about though was keeping it on the Windows machine it came with and adding it to Bootcamp/Parallels on your Mac at the same time.  If you have an OEM licence that isn't permitted (anywhere); if you have a retail licence you can do this provided the two operating systems aren't active at the same time.
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