I've used a big, fat Mac Tower since 2004. Lately, I've been getting messages that certain software is no longer supported. If I upgrade from 10.5 to 10.6, will that OS support Quark 7.31, CS3, Acrobat CS3 and Pro, and Office 2008? If so, how high can I go before I'll need to upgrade my software? Or would it make more sense to use my system just for my work and get separate laptop for all my email and internet work?