Set up a new installation and the users who have moved from Exchange to Zimbra, use the Outlook Connector to access mail. Having an issue where when they try to use MAPI plugins on from other applications like Word or their accounting system that they used to use to send email from the other program and they're getting errors like "Word couldn't send mail because of MAPI failure: "Unspecified error""

Is there anything I need to do to get the connecting functionality working with the ZCO?

Thanks