We run ZCS Open Source Edition for a number of very small businesses (~10) in our business building. In total of just about 60 accounts.

Once user have now several times reported that appointmens disapears in his calendar. The other users invited to the same meeting had the invite in their calendar. The same problem goes the other way when he is invited to a meeting. At some point it disappears from the calendar.

About ZCS:
Release 7.1.3_GA_3346.UBUNTU10_64 UBUNTU10_64 FOSS edition.

About he user:
Zimbra Desktop version: 7.1.4
OS: Mac OS X 10.6.8
He only use Zimbra Desktop.

Myself I run ZD on Ubuntu Linux 11.10, and I'm not able to recreate the issue. He can do so.

I'm not able to find if this is a known issue. Any suggestions?