In this case, the Task Scheduler status of "Could not start" was caused by the Task Scheduler losing the password of the configured "Run as" user. The Event Viewer logs and the a.logs did not contain any information pointing to authentication or credential problems.
NOTE:: As a shortcut, Re-enter the Username and password to the NS.Weekly schedule. When you run the NS.Weekly schedule, it will re-create the rest of the Scheduled tasks with the correct access credentials.
Applies To
Notification Server 6.0 SP3