When some creates an Outlook Item containing a group of contacts and sends it to another person, that person should be able to open up the attachment and click "Save and Close" and have that group of contacts added to the Outlook Contacts.
Right now you have to drag and drop the attachment over the contacts icon from the mail page of Outlook or save out the attachment then drag it back into Outlook. Save and Close would make much more sense directly from the attachment view plus save time.