find apple user id using macbook serial number

Um, you don't.

There is no one-to-one correspondence between serial numbers and Apple-Ids. One device could have several different Apple-ID associated with it, another could have none. A few might have only one.

But why would Apple violate anyone's privacy to tell you someone's private Apple-ID(s)?

Why do you need that information?

sarath06 Said:

"find apple user id using macbook serial number: how to find an apple user id using macbook serial number?"

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Finding an Apple User ID Via Serial Number:

You can Verify if it is Under YOUR Apple ID:

Go here: Check your Apple ID Device List to Find where you're Signed In - Apple Support. You'd click on a device shown, and view its Serial Number. If it matches, then the device is associated to YOUR Apple ID.

if you ever had it your possession, you could use this:

If your Mac is lost or stolen - Apple Support

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