You can use Easy2Sync for Outlook either to synchronize all objects in a PST file or just the tasks. If you want to synchronize only the tasks, click on the button "New" and choose the right wizard for this.
Please purchase the Business Edition to synchronize tasks.
Tasks collections in Easy2Sync
You can collect multiple Easy2Sync-Tasks in one task collection. This collection can be then started and all tasks in the collection will be run consecutively. You can create task collection with the button "New"