Hi, I use Komm's Update Checker to update my WIM image and I only use one image, that I would update once new KUC version would appear and it would always seem to remove unused updates. However I noticed that that my WinSxS grows bigger and bigger each time, even after superseded updates are being removed. So decided to make an experiment and removed ALL the updates except like 4 permanent ones to the servicing stack. And it worked.... superficially as all files used by the OS that is system32 files and sysWoW64 files were reset to what they were in a clean SP1 WIM but all the deleted updates with various file versions still reside in WinSxS folder. What is the point of removing superseded updates when they get stuck in there forever? This behaviour isn't KUC related as even by using windows update and removing the updates afterwards they are still occupying space in WinSxS folder. I provided an example for multiple versions of ntoskrnl: A total of 11 ntoskrnl.exe versions in WIM that had all updates removed!? sick! Then i thought, OK maybe I could install KB2852386 that would clean the old updates but no, it didn't work. So tell me, is this behaviour by design? Is the only way to have cleaner WinSxS is to take a clean WIM, update it and then when we want updated version, take a clean WIM again so that old updates wouldn't pile up there?