according to the write up - enforcecache will locally cache the files AND set desktop cleanup wizard to never clean the location. Also, when using office update, it looks at what updates have been installed according to the msi...using office shrinker, I no longer have the french spelling and thesaurus, but office update said its installed...so that leads me to believe it does a check on the msi and not actually what files are installed...(it could just be a reg thing but that is still done through in my case pro11.msi)