When trying to synchronize a calendar while the server is not accessible,
exceptions are thrown all the time, causing very high CPU load.
This happens both when the network is down (causing UnkownHostException)
and when the wrong server is accessed (causing NullPointerException, log attached).
The latter happens when my Laptop using OpenDNS is connected to the Internet,
while the calendar server of my company is accessible from the company intranet only,
and OpenDNS redirects the domain of the server to a default error domain.
Severity: Highest, since this makes DavMail unusable, as it blocks my machine\'s
desktop server Xorg (running Gnome 2 on Ubuntu 12.03).