Code:
su - zimbra
mysql
use zimbra
select id from mailbox where comment = 'user@domain';
use <id from the select>;
select * from appointment;
you should see lots of appointments; whittle down the correct date range and using the item_it you can do
Code:
su - zimbra
zmmailbox -z -m user@domain deleteitem <id from the sql>
to remove the bogus entries.