default folder preference file is damaged
One can find the Mac OS user guide online on sites such as Apple, Display Link Manuals, Amazon, and Live Scribe. One may also go to their local Apple store to get one.
Mac OS has a graphical user interface (GUI).
None
I believe that you can get good answers in apple User Experience guide: http://developer.apple.com/documentation/UserExperience/index.html#//apple_ref/doc/uid/TP30000440-TP30000437
Since there is no such version of Mac OS as in your question, I'm going to assume you mean Mac OS X 10.4, instead of 14.0. And no, Quick Books does not come with Mac OS. For a list of software included in the current Mac OS version, see the Apple Inc website at: "http://www.apple.com/macosx"
yes
Mac OS
Mac OS 10.5 is the fifth version of Mac OS 10 and is codenamed "Leopard". It provides stability enhancements as well as new features and a better user interface.
The Kodiak version of Mac OS X was an early test version released in 2000 it was designed to expire in 2001, when the first official release of Mac OS X (called Cheetah) arrived, and will no longer work - so that could not be considered very user friendly.
Providing the Intel based computer is manufactured by Apple then their Mac OS X software can work on it. The Mac OS X user's licensing agreement prevents Mac OS X being used on computers that are not made by Apple.
It's all opinion, but although I am a Windows user, I would say Mac.
GUI (pronounced "gooey") = Graphical User Interface