LeftieBiker wrote:If the cable running from the panel to the outlet box is armored, then the box is probably grounded, and a grounded outlet can easily be added as a result.
Only if the armor has a bonding strip run along the inside of it and welded to each corrugation. That would be modern type AC cable.
Old type AC cable didn't have a bonding strip, and type MC cable doesn't have a bonding strip. The resistance of the armors on those cables is not dependably low enough to function as an EGC.