[whpalmer4]

If you have two parties editing the same action at the same time, you are going to have trouble, as the syncing mechanism isn't designed to accommodate this practice. Syncs happen on a per-action basis, so even if you are changing a different part of the action (one changes the note, another changes the due date), the last change synced will wipe out the other. It doesn't have anything to do with whether you use Bonjour or MobileMe.