Comment 45 for bug 595551

There *is* a work around, at least for Google. It appears that all of Google's calendars are available via www.google.com AND calendar.google.com. Entering different calendars using the different hostnames will make it work. I'm sure other hostnames might be available if one looked hard enough.

One must remember that Thunderbird is actually implementing the spec here: they are keying usernames/passwords to a hostname/resource pair. This is the *correct* behavior. The incorrect behavior is that Google uses the same resource for all its calendars, when (at the very least) it should use a separate resource for each "apps for your domain" domain. In short, the bug is Google's not Thunderbird's.

That being said, Thunderbird may want to allow behavior that is different than what the relevant RFC states in order to provide a better user experience with Google and other major hosts who don't implement the RFC in the best way.