MAC's RULE!
I've been using a Mac for over 10 yrs now. I've been on both PC and Mac platforms, but personally I LOVE Macs. The new Mac OS X (not sure what version they are up to now) is even better. It runs smoother with out hang ups or crashes. I use MS office for Mac along with my usual Adobe programs. At work, I'm linked to our corporate network. I can store programs on the server just like everyone else who all are on PC's. My files for Excel, Word, PDF's, jpg, tif, etc are all compatible with the other PC's, so they can open these files if the need too... we all share files.
Oh, also you can even run PC programs with a program called Virtual PC. It even looks like PC's MS windows. I don't use this, but it an option.
I have iBook at home and a older G4 at work... wish my boss would let me get a new one.