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@Akram: first of all, me is extremely widespread even in formal contexts. Secondly and most importantly, "informal" is not "wrong", contrary to what you suggest in your answer.
@Reg: Thanks for confirmation. I wasn't sure, but I didn't find it "wrong" to say "Me." if a professor calls you for example or in some business meeting (if you can consider them formal contexts).
Sorry, this is wrong. The unmarked form for pronouns in English is the objective, not the nominative one. This has been discussed over and over and over and over again.