Calendar:WCAP Provider
Please remind that this provider IS STILL PRELIMINARY, NO WARRANTY!
Using
Initial Steps
You currently have two options to switch on WCAP support:
- Setting 
calendar.wcap.enabledtotruewill switch on the provider (only). - Setting 
calendar.prototypes.wcaptotruewill enable the provider and the enhanced (though still prototypical) WCAP UI. (recommended, Lightning only) 
Subscribing To Your Calendar
The Sunbird/Lightning Create New Calendar wizard comes up with a third Format type for remote calendars (Sun Java System Calendar Server (WCAP)).  As location, provide a HTTP or preferrably HTTPS URL to a Sun Java System Calendar server.
http://sd-calendar.staroffice.de/
You can encode your common user-id into the url which will be used for the login prompt, e.g.
http://jdoe@sd-calendar.staroffice.de/
After creation, you need to switch the view on for this calendar in the Calendars list.
Login
For login, you will be asked for a pair of UserName/Password.
If you don't pass login, you will be asked again.
If the calendar server does not support HTTPS, you will be asked whether to continue the login.
UI
If you create items, keep care to have the correct calendar selected and checked in the Calendars list, because this will be the one for insertion. It can be confusing if the selected calendar is not shown (unchecked), i.e. you won't see your newly created event. IMO we have to improve this.
Logging
Log Level
The provider can log for diagnose purposes.
Logs go to the js console, eventually to stdout (if user_pref("browser.dom.window.dump.enabled", true);) or
log file.
Three log levels are defined:
- 0 → no logging (release, default)
 - 1 → some logging, connection etc., but no calendar data
 - 2 → verbose log
 - 3 → very verbose log
 
You can set the log level your user.js in your profile:
user_pref("calendar.wcap.log_level", n);
or via Edit→Preferences→Advanced→General→Config Editor... (Thunderbird 2, Unix) and even change it without restarting Thunderbird.
Log File
You can specify a log file. Logs are always appended to the specified file.
user_pref("calendar.wcap.log_file", "/system/path/to/log/file");
Misc
- contribution tracked via issue 340949