Hi David,

great thanks a lot this solved the time shift problem.
I did not had time to play with the different parameters. For now I simply
added all of them.
I guess it has to do either with the timezone or with the daylight settings.
Maybe you want to add this to a "How-to install for SOGo" as a workaround.

One problem remain. If I change something in the caldav calendar, the time
information in org get lost completely.
E.g.
* Meeting <2013-01-16 Wed 14:00>
becomes
* Meeting
It subsitutes the right entry and hence I believe it gets the ID stuff
right. However, it seems to have trouble to interpret the time information
right (and ignore them?).
If there is a way to help you debugging this please let me know.

Thanks again a lot


Torsten


(setq org-caldav-calendar-preamble
>   "BEGIN:VCALENDAR
> PRODID:-//Inverse inc./SOGo 2.0.3a//EN
> VERSION:2.0
> BEGIN:VTIMEZONE
> TZID:Europe/Berlin
> X-LIC-LOCATION:Europe/Berlin
> BEGIN:DAYLIGHT
> TZOFFSETFROM:+0100
> TZOFFSETTO:+0200
> TZNAME:CEST
> DTSTART:19700329T020000
> RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
> END:DAYLIGHT
> BEGIN:STANDARD
> TZOFFSETFROM:+0200
> TZOFFSETTO:+0100
> TZNAME:CET
> DTSTART:19701025T030000
> RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
> END:STANDARD
> END:VTIMEZONE
> ")
>
> If it works for you with such a timezone definition, it'd be interesting
> to know if SOGo needs all of that or if you could drop most of this
> stuff.
>
> -David
>