Case: I bought a new Macbook pro and I got lion as free upgrade.
By mistake my friend's apple id was stored in the Mac App Store and I didn't notice the error when I entered my redemption code.
I already redeemed that lion upgrade using my friend's id on my machine.
The purchase, download and upgrade all happened on my machine. I intend to keep on using that Lion for my machine only.
I download new apps and everything using my apple id not my friend's apple Id. Will it work? Or for my new upgrades or downloading new apps, do I need my friend's ID and password.
Moral: Lion has been downloaded with different ID and Now I want to use my apple id to install new apps.