We use Zimbra 5 beta 2 on SLES10 SP1 with T-Bird 220.127.116.11 and lightning 0.5 for calendaring. I have setup lightning to connect to the zimbra user calendar and when i make changes in lightning, they show-up on the ZCS calendar. The problem we are having is events that are created still give an alarm days after the event. It seems that writing back to the ZCS calendar fails b/c when i "dismiss" the events they still show up. Does anyone else have this problem and how do we correct it?