I recently had some time to work myself around Outlook 2013 and was looking for a way to display new mail notifications via growl, so I get notified when not at my computer (using “Notfiy My Android” in conjunction with growl to forward any messages to my smartphone) – you might remember that my company shut off the access to the Exchange servers via smartphone. So I don’t get the full mail, but I get a notice that a new mail arrived, including its subject. Pretty neat.
I found a little VB-script that you can use in Outlook 2013 (or any Outlook for that matter) to get notifications about new e-mail arriving. You can find the script including instructions over here:
Works like a charm!