We've been running a ZCS "cluster" on three SLES9 (SP3) machines for about a year now. Since implementation we've dealt with a number of problems in the calendaring components.
Two key problems that've resurfaced persistently are:
1. Calendaring entries disappear (not unlike the description in bug 14311). This happens to users who make regular use several possible combinations of the Outlook Connector, the web interface, and blackberries (integrated via the third party service called Notifylink)
2. Around DST (both this year and last year), we've had a bevy of appointments shift an hour - despite having all the appropriate OS level DST patches, and a ZCS update that should be aware of the latest DST definitions. Last year, all recurring meetings that were created before the DST change had to be manually recreated even once the DST change was fully in place. This year, we've been unable to ascertain any workaround for the problem - this particular set of symptoms makes me wonder if ZCS isn't using a GMT relative time definition (say GMT-5) rather than a DST time definition, but I've not been able to locate any documentation that would clarify this one way or the other.
Everytime we've identified a known bug that might conceivable be creating these problems, we've update to the latest patch release; but (so far) we've only succeeded in moving the problem around - one or two users may see temporary respite, but a new batch of users will begin to see the problems
Unfortunately, there doesn't seem to be any official channel that provides us the opportunity to communicate directly with the developers assigned to these bugs (even for a fee). Zimbra support has been quite polite, but utterly unable to provide any assistance on this set of problems.
I'm hoping someone on these forums who've found solutions to similar problems may have a useful suggestion, because I've lately been asked to estimate the overall cost of a complete switch off from zimbra and on to MS Exchange. This is a step I'd prefer to avoid, for any number of reasons; but this problem's grown to affect users at the highest levels of the our company and my users' perception of this product is becoming quite poor - many now use the word "zimbra" as an adverb (as in "I just got zimbra'd"
Anyone able to throw a drowning man a rope?