Overall I have been really impressed with Zimbra! You guys rock!
I have however more recently run into some serious problems.
1) When creating events, they appear an hour later once on the calendar.
Eg. I create an event for 9am but after finishing event creation, it shows up as a 10am event.
2) Some accounts cannot see any events on the calendar at all!
On my personal account, events have disappeared, new events are not visible either. (I know they exist because they show up in free/busy information)
3) Some users have reported trouble removing an INSTANCE of a recursive event. It just won't delete.
Any ideas on these problems?