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Microsoft is enabling BitLocker device encryption by default on Windows 11
(www.theverge.com)
This is a most excellent place for technology news and articles.
If you have a microsoft account that you've attached to at least one windows profile, then that machine has been registered to that account, and the bitlocker key will be stored and kept to be viewed and retrieved by logging into their microsoft account, if the machine has not been registered to a microsoft account you will either have to have jotted the very lengthy key down or have saved it to a usb