First compose a new MMS from your Messages app. After you pick who you are sending it to, put a subject in, then click the scroll wheel and it gives you several attachment options. Choose "Attach Address".
Boom...there ya go.
When you receive an MMS like that, scroll to the bottom where the VCF attachment is and upon a click, you have ability to Add it to your addresses automatically.
P.S. I just checked it from my computer and the vcard file came through Outlook perfectly and looks great with all the information!