Asking again: any fixes for http:/1.1 300 and 500 errors in iCal-Server?

Hi there
I've set up several OS X servers in the last few months, most of them with ical services up and running. Quite everything works smooth, but most customers experience sooner or later errors like
http:/1.1 300... (mostly with repeating events, which seem to be buggy in iCal&CalDAV already for a long time)
http:/1.1 500...
neither are there any relevant entries in the log, nor does it occur on a regular base - in fact, we can observe these errors all 2 or 3 weeks or so. Stopping an restarting of iCal services usually fixes them. DNS is set up perfectly well, including the SRV-entries.
What about you? Do we just have to live with these errors? Or do I really have to sell Kerio to my customers?
Thanks for any suggestion
Regards
Roman

Hi Roman
I have had a few years setting up and administering various calendar options on Xserve.
The Apple built in iCal server is by far the worst of the lot.
Previous to that we used phpicalendar- http://phpicalendar.net/documentation/index.php/Main_Page
It is a bit dated and does not support the same feature set as the Apple one. It works well though.
Kerio on the other hand is great, works well and is easy to use, apart from accepting invites on iOS devices. Its also a much better mailserver than Apple's one.
Another option is to write a script to run everyday to stop and restart the ical service?

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