= Lightning =
Lightning is an Add-On for [[thunderbird]] to show remote calendars e.g. of our Zimbra Mailserver.

 * Open Thunderbird and switch to the '''Calendar''' view (lower left corner):

{{attachment:lighning02.png}}

 * Move the mouse over the still existing local Thunderbird calendar ''Home'', press the right mouse button and choose '''New Calendar'''. Follow the next screenshots.

{{attachment:lighning03.png}}

{{attachment:lighning04.png}}

 * Replace the username in the URL with your own.

{{attachment:lighning05.png}}

{{attachment:lighning06.png}}

= Further Calendars =
 * You can configure more than one calendar.
 * To find out the right URL:
  * Switch to Firefox and call http://mail.math.uzh.ch .
  * Choose tab '''Calendar'''.
  * Move the mouse over the calendar name on the left side.
  * Right mouse click, choose "Share Calendar".
  * Copy/paste the Calendar URL (highlighted in the screenshot).

{{attachment:lighning10.png}}

= Known problems =
 * If you want to '''delete''' an appointment, best do this via web interface in Firefox.
 * If you really want to delete appointments in Thunderbird, you have to:
  * Open the event
  * Choose: '''Option > Status > Canceled > Save and close.'''
  * Delete the event with: '''right mouse click > delete.'''
  * If you delete the appointment without prior canceling, the appointment will be deleted in Thunderbird, but not in Zimbra.

 * Calendar gets out of sync:
  * From time to time it happens that Thunderbird/Lightning don't show any new appointments or changes.
  * Delete the calendar in Thunderbird (you only delete the connection, not the calendar itself).
  * reconnect the calendar.

 * Reminder
  * If you create a new appointment in Tunderbird, the default is '''not to remind''' you.
  * If you create a new appointment in the Zimbra webinterface, the default is '''to remind''' you - take care about many unwanted reminders which will appear in Thunderbird suddenly!!!