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Jul 18, 2014 6:25 PM in response to M.pocby FoxFifth,This is a user-to-user support forum. You don't give any details of whether it was you signing in on your own Mac, whether your Mac was stolen, or any other useful information. It does seem fairly clear advice -- if you didn't sign in to iMessage on that Mac you should change your Apple ID password. Instructions for that are at Apple ID: Changing your password
