How do I resolve the issue of missing or disappeared tasks in my Outlook task list?

1. Check to make sure the tasks are still available in the master copy or original list.
2. Reconnect any external tasks that may have been added as a delegated connection.
3. Make sure to properly sync Outlook tasks with a connected web application or other locations.
4. If tasks were deleted in the project, they may also be deleted in Outlook.
5. Manually sort Outlook tasks to re-populate any empty or disappeared tasks.