Sync Kolab works well Rated 4 out of 5 stars
I have found this to be a top little add-on. Initially I did have problems with the loss of some shared calendar entires exactly as per ikpetrof mentioned. However I figured out why. I am using Citadel as my IMAP server and it seems that Citadel can accept Sync Kolab with either the ICAL/Kolab1 OR XML/Kolab2 formats - but not both together. That means ALL clients need to sync in the one format - one or the other. If just one client is using a different format, sooner or later you WILL lose calendar entries. I can only speak for Citadel, I don't know how other IMAP servers react to differing sync formats. Having said that, one thing I would like to see, is a way of stopping clients from fiddling with their sync settings. Still all-in-all, it's a great and very useful little addon.This review is for a previous version of the add-on (1.0.3).