The main reason I don't like Outlook as a PIM is that it only supports 3 levels of priority. I've grown very used to having 5 levels from Palm Desktop.

Outlook allows you to associate multiple catagories with each task. It also shares catagories across the different functions (Cal, Task, Contacts). Those differences can also be annoying.

Palm Desktop is also easier to backup. Outlook databases seem to always be huge.

At home, I sync to Palm Desktop. At work, I sync Cal to Outlook and everything else to Palm Desktop (using SwitchSync).

- Benjamin