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You do like to live dangerously, don't you.
Make a good backup, because if it doesn't work, you may have to roll back to what you're running now. Remember, you're jumping forward three Mac OS X versions.
LOL . . . well, when you're my age . . . why not! Yup . . . 3 OS X versions forward . . . but this one is FREE!!!! Therein lies the problem.
Anyway, perhaps it would be wise to leave well enough alone. I'm not sure that the fun of playing with a new operating system warrants the backup and re-installation of the old, tried and true.
If you have one computer, and you need this computer to use to make money, then I'd hold off a little bit. Otherwise, you're opening yourself up to possible pain.
I have two computers and just updated my secondary computer so I could test how applications are working. I can say that InDesign CC and InDesign CS6 work fine, but can't say anything about earlier versions.
That could be chalked up to dumb luck or clean living, but it's no
assurance it will work for anyone else.
Sorry, but you're on your own with Mavericks and CS3.
If you do make the leap make sure you have updated the application I have been unable to update illustrator ro 13.0.1 or 13.0.2 since upgrading
I have CS3 and Mavericks on my home computer, and I can tell you that it runs. I haven't done any heavy lifting on my home system for a few years, so I can't say that all of the CS3 functions work, so take that with a grain of salt.