This desktop tools enhancement is new in the Developer 5/07 release.
The Lightning 0.3 feature includes the following new features:
Local calendar
CalDAV support
WCAP 3.0 support
Event or task recurrence
Meeting arrangement
Event View- Day View, Week View, Month View
Event or task list view
Basic handling of events received in email
Event or task alarms
Calendar import and export
Localization support