Remove Google Calandar & Lightning

1. Uninstalled Provider & Lightning, shut down TB.
2. Removed the calendar-data folder
you find it here ( C:UsersYOUR_USER_NAMEAppDataRoamingThunderbirdProfilesuvvvzg0u.default)
3. Checked the folder for any Provider folders or files, if yes delete it
4. Edited prefs.js, and removed ALL references to calendar (there were numerous entries)
5. Re-started TB, and ensured everything was gone.
6. Reinstalled Lightning. Local Calendar was created
7. Rebooted TB, just to be sure.
8. Reinstalled Provider,
9 add your google mail account