>>Hi,
>>If they are OEM Licences they die with the Motherboard/Machine.
>>
>>>Hi,
>>>
>>>I'd like to upgrade my PC by changing the motherboard and leaving everything else the same. How would that Windows and MS Office licenses?
>>>
>>>TIA,
>>>
>>>Alex
>
>What about those cases where the motherboard goes on the blink? Are you allowed to replace a damaged motherboard?

It's the same as when you upgrade to a newer motherboard and/or cpu. The installation builds a new HAL, so it won't work. A call to Microsoft will generally yield a new key that you can enter and reinstall. They will want to play 20 questions, but you should be able to get a new key.