This client is experimental! We tested Thunderbird 3.1 with lightning 1.0b1 and Funambol client 1.0b3.

You can find the lighting Calendar Extension for the Thunderbird email client at:

https://addons.mozilla.org/af/thunderbird/addon/lightning/

The beta Funambol client is not available from Funambol currently. It can be found at:

http://www.memotoo.com/

Follow the installation instructions and use these settings:

SyncML Server Version: 1.1
SyncML server URL: http://go.imageway.com/syncml (or look it up at Settings -> Synchronization in your Mobile Office)
Port: 80
Username: Your Mobile Office full email address
Password: Your Mobile Office email address password