Notifications to update personal distribution lists
    Every 15 minutes, 
BEMS
 sends a notification to the BlackBerry Work
 and third-party apps that
      specifies any changes to the user's personal distribution lists in the user's contact folder
      after the specified time. The BlackBerry Work
 and third-party apps call the contactgroup API to retrieve data and update
      the personal distribution list in the BlackBerry Work
 and third-party apps.