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I think overall you should be pleased with it. There will be some transition but it will run faster and much more solidly. Pretty much every Microsoft Office type of file can be used on it so you're probably okay as far as data goes. You won't have to worry about all those nasty Windows virus programs either but security is going to be a little more complicated to get set up right unless he's already done that for you. I'm surprised he choose that distribution of Linux, its learning curve is steep compared to other distributions.
I've found that Ubuntu seems to be easier to get going with and easier for people who are unfamiliar with Linux to use. The great thing about Ubuntu is the huge support community available and the ease of adding software for those who are not very Linux literate.