Meeting requests sent from Outlook (non-zimbra - outside associates) have no details whatsoever.

The meeting request arrives in the user's mailbox and is "seen" as a meeting request (offering accept/deny buttons) by the web interface but the body of the message is completely blank. No details as to when the meeting is or where.

Interestingly, the "preview" on the message list shows some information but nothing is displayed in the preview frame or when the message is detached.

Zimbra 4.5.6