Sadly this will not work. A new mother board is in M$'s eyes a new PC. Because well technically it is. A new motherboard and a new CPU is the heart of a PC. So technically they have got a point.
So if he does get a new mobo and CPU. The license cant be transferred. But telling M$ a little lie might get it to be used again. You know saying that your hard drive crashed and you had to get a new one...something like that.
Replace motherboard equals new pc - Google Search
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Here is what Microsoft has to say:
“An upgrade of the motherboard is considered to result in a “new personal computer†to which Microsoft® OEM operating system software cannot be transferred from another computer. If the motherboard is upgraded or replaced for reasons other than a defect, then a new computer has been created and the license of new operating system software is required.â€
So if he does get a new mobo and CPU. The license cant be transferred. But telling M$ a little lie might get it to be used again. You know saying that your hard drive crashed and you had to get a new one...something like that.
Replace motherboard equals new pc - Google Search
The google search to find all the related articles.