整合Mozilla的Email客户端Thunderbird和日程簿软件Sunbird。Mozilla Sunbird 参见这里，Mozilla Thunderbird 参见这里。

What's New in Lightning 0.7
Lightning 0.7 is the latest release of our calendar extension for Mozilla Thunderbird®. We recommend that all users upgrade to this latest version.

    * It is now much easier to switch between the mail and calendar parts of Thunderbird thanks to a user interface redesign.
    * A redesigned event/task dialog has been enabled to gather feedback from the community. It offers a much cleaner user interface and additional functionality including:
          o Events/Tasks can be created in different timezones
          o Attendees can be added from a local or corporate LDAP directory.
          o Free-Busy information is available for users of the Sun Java Calendar Server.
          o Integrated display of recurrence patterns, reminders and attendees
          o Custom recurrences and reminders
          o Clear separation between tasks and events
    * The new event summary dialog lists all the details of tasks and events for calendar which are read-only.
    * The Today Pane gives a quick overview over your current tasks and upcoming events. The Today Pane can be enabled/disabled by a toolbar button.
    * Colliding events (events in the same time slot) are shrunk so that they fit into the display of a day. This no longer affects other events on the same day.
    * A full list of changes that have gone into this release can be found on The Rumbling Edge website.