Microsoft Product Key

Can a Windows / Office Product Key be used on another system after the software has been installed from the current machine? How will Microsoft know that it's a different machine?
 
after the software has been installed from the current machine?
You mean uninstalled?

Yes you can do that with retail copies of Windows, but OEM licenses do not transfer. They are tied to the motherboard.

Office can transfer between systems if it is a multi-license or if you uninstall it from an existing system.
 
Many pieces of software these days require activation, and won't allow software be be running simultaneously, or even activated, on more than one computer at once. In that case you need to deactivate it from one before installing it on the other.
 
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