• Interesting.  According to BOL, in the topic "Using uniqueidentifier Data":

    The main advantage of the uniqueidentifier data type is that the values generated by the Transact-SQL NEWID function or the application GUID functions are guaranteed to be unique throughout the world.

    If they "guarantee" uniqueness, and someone can demonstrate a reproduction of the same GUID, will they reimburse that someone for all their development time, software & hardware costs, etc...?

    I doubt it highly.