I'm not a great fan of Outlook. Don't take me wrong, I use it @ work, but its a resource eater. I prefer the Thunderbird.
The problem was kepping things sync'd. Two weeks ago learned about http://www.birdiesync.com/ , a sync tool for thoose of us that use Thunderbird, SundBird and the new Lightning extension for ThunderBird.
But, you must pay for it :(
This is goes againts the ideia of the Thunderbird, if I don't pay for it, I should I pay for the sync.
Well, it seems that someone read my (and many others) mind and released (still in beta) the FinchSync project.
It's free and works over WLan.
Go on and give it a try.