Moving a drive+OS to a new system has 3 possible outcomes:So I am building a new pc and I am transferring My old SSD do I have to reinstall windows or could I just plug it in and have it boot up?
Even OEM keys can be moved if they are tied to a MS account.Besides, your m.2's windows license is linked to your old build's motherboard. So if you just plug it into your new build windows will not activated. You should go to the microsoft website and review its procedures for transferring a windows license. Whether or not you can transfer your license will depend on how you obtained it e.g. retail purchase or oem provided license.