I found two other threads related to this, but both were cases involving Zimbra running on a corporate network.
I've just installed Zimbra Desktop and am using it for the first time. I'm running it on a Windows XP system, and my email is retrieved via IMAP. However, I'm encountering the same problem that others encountered on a corporate network.
When created a new calendar entry, the attendees field is locked out. When hovering the mouse over the field control, a circle with a slash through it appears, and there is no way to get the cursor into the field or add attendees. I can't add them from an address book or do anything.
Zimbra Desktop is supposed to have calendar support like Outlook 2003, 2007 and 2010, but this is not a good start.
I'm trying to set up a meeting urgently, and I cannot add the attendee who has requested the invitations.
Someone please help ASAP.