I just transferred from my old up to date Mac to my new Mac and it is asking for a com.apple.smig keychain password and I don't know where to find it!
Which application and Mac is asking for it ?
You can find some of the system passwords in Keychain in Applications > Utilities folder. Check on your old mac first.
I just transferred from a PC to MacBook Air and it's asking for that - where would I find it on a PC?
It's asking for it as I'm starting the computer for the first time - not a specific application.
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