I once managed to get SQL 2005 to generate duplicate GUIDs. My insert statement managed to generate set of three identical GUIDs pretty consistently. Unfortunately we could never replicate this outside of our, rather large, application and so ended up just doing it differently. It was probably to do with the records being generated within the same millisecond, and so not that likely in most applications. So, yes you should definitely check. While in theory you should never get duplicates I have had them to often. If you have knowledge, let others light their candles at it. Margaret Fuller (1810 - 1850) www.JacksonSoft.co.uk