Priacta discourages Windows Mobile 5 or Pocket PC for managing tasks. The technology is slower and far less reliable than newer options. Consider upgrading to a phone that works well with your ideal task list. (That is a good time to choose a new task list, if you are considering it.)
To sync, you’ll need to use Nuevasync if you stick with Windows Mobile 5 and Toodledo (www.nuevasync.com).
No syncing is required if you access your Toodledo tasks at www.toodledo.com/slim. You will need an active cellular data connection.