That is very strange. I just done slipstream using your source and new cabs were created. But, you said that when you installed that Office, Microsoft Update required all post SP3 updates, but not SP3, which means that cabs were updated. You can also verify, if you open for example Word, and the select Help -> About. Cheers No, the cabs were not updated. There is no SP3 showing in the "about" after the install. I agree it's strange that MS Update just gave me the post-sp3 updates as necessary. Maybe because of the xml and setup and other files that were updated. I happy to do some step-by-step test if it will help you. You need to tell me exactly what you want. You have the exact same source I do, though. -marsha I can only sent you a test version which will keep temp files so I can see if something went wrong. I'll PM you soon, I'll just make necessary modifications and I'll upload it. Cheers