I also have a MicroVAX I (Currently housing a KA650,
but I still have the
 original boardset).  It would be fun to get it running VMS -- the MicroVAX
 I tops out at VMS 5.1, though.  Where can one find media (and licenses) for
 older versions of VMS?
 - Josh 
The oldest VMS I could find is 5.2.  Original licensing is quite troublesome to
deal with (trust me, I know).  The hobbyist licenses should work though.
Kevin