The Mac App Store program can be removed from Snow Leopard, but once updated past OS X 10.6.6, reinstalling it may require a little more than simply installing a combo update.
Despite early speculation that the OS X 10.7 Lion installation would require the latest version of Snow Leopard, the software requirements specifically state you need OS X 10.6.6 or later.
Apple says users are flocking to the newly launched marketplace, which was made available in the Mac OS X 10.6.6 software update.
A number of people are experiencing an error stating "unknown error 100" when using the new Mac App Store in OS X 10.6.6. Here are some ways to overcome this issue.
Apple has released OS X 10.6.6, which brings some stability and bug fixes but mainly adds support for Apple's newly released Mac App Store for OS X.
It's available for now only to Mac OS X 10.6 Snow Leopard users, through the 10.6.6 software update. It will be made available in Mac OS X 10.7 Lion later this year.
Ahead of the public release of Mac OS X 10.6.5, Apple has seeded Mac OS X 10.6.6 to developers. Apple has also announced that Xserve will no longer be available after January 31, 2011.