The problem is half the way solved:
Yet, I do not know, how the buggy entry in the database was produced, but I found it and deleted the corresponding entry in the calendar itself (not in the database)
zmprov getMailboxInfo XXX gave me the mailboxId XX
login to the mysql server with mysql as user zimbra
show databases;
use mbxgroupXX;
show tables;
select * from appointment; showed me the buggy entry - I deleted it in the calendar gui. |