Zimbra allows publication of "free/busy" times via a website like:
(Very handy for letting people outside your organization know when you're busy.)
A lot of us use Firefox for Zimbra Web mail (it has many advantages),
but I have found one (only one so far!) bug in Firefox 4.0 support.
The freebusy web page displays fine in Chrome10, IE9, and Fx3.6, but Fx4.0 gives:
"HTTP ERROR 501
Problem accessing /service/home/ddd@wherever. Reason:
not implemented yet
Powered by Jetty://"
Does anyone know why yet?