Microsoft Outlook 2007 Alternative

I use Microsoft Outlook 2007 for appointments and contacts which I sync with my Palm Centro. Now that I've switched, I'm trying to get away from Microsoft products. Can anyone suggest an alternative (free hopefully) that has the same capabilities and is Palm Centro friendly?

Thanks again.

Love the Mac so far!!!!

To get it to sync with Apple's Mail and iCal you may need to buy the Missing Sync

Palm OS Sync with Mac - The Missing Sync for Palm OS