2007-10-25 15:58:35 UTC
In Thunderbird w/ Lightning (0.7rc1), you can add people to invite from your address book. There is a table on the invite interface where Free/Busy time can be viewed, but I don't think Lightning knows how reference their calendars to display Free/Busy time. There is still no way to Browse what calendars are stored on the server. The server side of this functionality could probably be implemented, but Lightning would still have to implement an interface to browse the calendars on the server.