I dislike everything MS...but I do like the concept of Outlook. That is to say, having email, To Do list, Contacts and Calendar all in one app sounds the way to go. Just, as usual, MS struggles on the implementation and produces and inelegant program.
I find Apple's approach of Email and Notes, Contacts separate from iCal (with it's own notes) a bit fragmented. I hardly open iCal and I never use it's Notes.