The new Share option in iPhoto is not recognizing either Entourage or Outlook for Mac as an option to email photos. However you can add your Entourage or Outlook email address to send using Share in iPhoto.
Open iPhoto v9.4.1 in Mountain Lion Select photo to share. Click on share icon (bottom right) Select Email A message window with “To” appears, your only options are to use an email account in Apple Mail. In iPhoto . . .
Continue Reading: Outlook 2011: Sending photos in Mountain Lion with iPhoto 9.4.1