I currently use the iSync solution against our 5.08 (soon to be upgraded) server on OSX 10.5.5. It works very well. I see from this forum that this is depreciated so in a test account I am trying out CalDEV. I seem to be having the following problem but can't figure out enough details to file a bug report.
I also make use of applications like iCal Events widget that read from the iCal database. It seems that regardless of the setting in the Zimbra preference pane for frequency of refresh, that when I am using CalDEV instead of iSync that the iCal application HAS to be open in order to pull down new events from the server. Is this true? That would be a regression in the behavior of the sync.