How do I uninstall BusyCal?
To uninstall BusyCal, launch BusyCal while holding down the option key to display the Startup Options dialog, then select Reset BusyCal and click Continue. Resetting BusyCal will delete the BusyCal database, and quit. All of your calendars will be preserved in iCal, iCloud, Exchange and/or Google. You may then drag the BusyCal app to the Trash.