Comment 72 for bug 595551

Just to keep things from being to Google-centric. We've been playing with a Davical server. URLs for the Calendar look like:

http://calserver.our.domain.edu/bob/home
http://calserver.our.domain.edu/morgan/home

Two different people, two different passwords to access, Lightning will only work for one of them at any given time.

The user community expects the kind of behavior exhibited by Apple's iCal product, you set up both calendars, they have a different user name and password associated with each calendar, and it WORKS.