I am trying to get the Lightning Add On for Thunderbird to work with Google Apps Calendar. Now I use to have this working fine with the regular Google calendar but the same type of settings do not work with the Calendar in Google Apps. For the standard Google calendar this works (htt p s://firstname.lastname@example.org/event[/url]) While using (htt p s://www.google.com/calendar/dav/user@userdomain/event) does not work. I have also tried (htt p s://USERASS@www.google.com/calendar/dav/CALENDAR_ID/events/) just results in an endless loop of asking for a User ID and Password. Even though I put in the correct ones each time and verified their accuracy by logging into my google account through Firefox. Note I put spaces in the https so VBulletin will not automatically change them into hyperlinks.