Originally Posted by Brett Kaiser
Any problems with Duplicates?
Using carefully contrived lab procedures I can sometimes generate duplicate GUID values. There are a couple of ways that I can do it repeatably, but I can't imagine those happening in the real world.
Because the GUID is a fixed size, it is guaranteed to have duplicates occur naturally in due time... The most conservative estimate I've seen for an expected collision is over 1800 years, and most estimates are in the tens of millions or more years. Even at 1800 years I don't expect any code I write or even the data associated with that code to be around anymore, and if it is around then I'm pretty comfortable that someone will have a convenient way to deal with the problem by then!