I get Office for free from my Job (I just pay the media costs).
My university has worked out some site lisence for employees so I can get it for free ... well somewhat , I pay a smaaaaaaall fee in order to pay back for the license lol... (M$ is sneaky...give it for free, or almost free to teh academic people, they will use it, get depended and they will force their students to buy it....)
Anyway, I use entourage for mail only. No contacts, no dates/notes. I use my PDAs for that. However if apple were to make an app comparable to entourage I would use it for that too, in order to sync my PDAs.
As for office, at work I use excel and word. At home, I rarelly use word. I can do the same tasks in text edit, and now with OS X I can get spell/grammar checking system wide (right?)