actually I sent a group contact as an attachment from outlook 2010 to a recipient who is using outlook 2007, he is getting the email with an attachment with an extension .msg and can not open it. however, I can internally open that group contact with no problem.
here what I suggested to a recipient to do.
open the email --> Go to contacts and drag and drop the attached group contact to your contacts but that didn't help either.
please let me know.