No, MMS is not an Outlook feature. It is a protocol for mobile devices;
http://en.wikipedia.org/wiki/Multimedia_Messaging_Service
Most mobiles today allow themselves to be hooked up to the computer and have
storage space on them. You can then copy the picture to your mobile and
forward it to somebody else via MMS. If the mobile devices are capable of
receiving emails, then you could of course also send an email directly.
Check with your phone supplier about the features of your mobile device and
which sync software and/or cable you should use in order to hook it up to
your PC.