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There is a free tool available, which allows two way synchronisation between Sunbird and Windows Mobile platforms like PocketPCs and SmartPhones. It also synchronizes Thunderbirs'd addressbook. It's written in Java and works on Windows, Linux and OS X. See for details: http://www.finchsync.com

Even without dedicated synchronization software it may be possible to export a collection of calendar entries from Sunbird or Lightning to your mobile phone and import entries into Sunbird/Lightning from your phone. Many newer phones use internal calendar and task managers that are compatible with the industry standard iCalendar format and allow you to send and receive calendar entries to and from your PC using Object Exchange (OBEX) protocol via USB cable, Bluetooth or Infrared. (see http://en.wikipedia.org/wiki/OBEX for a short description)