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Title says it all, but I'd like to know if Gmail thread ids are unique across users. For various reasons I'd like to index a global datastructure based on these ID's.
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Your Gmail address is unique. If anyone tries to create a Gmail account with a dotted version of your username, they'll get an error saying the username is already taken. For example, if your address is [email protected], no one can sign up for [email protected].
It's only unique for an individual user. It's quite likely you'll get collisions across users as it's only a 64bit field and is largely time based.
If you need a Globally unique ID best to combine it with a user identifier.
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