With better support for modo 
Can Unity support this software - PLEASE
*AutoRig2 - a really flexible, fast, editable autorigger (by Ulven)
*Point Animation
*Improved Dynamics Softbody
*Keyframe Productivity Tools
*Pose System
*Cage Deformer - this is the shits. volume preservation deformation
*Lattice Deformer -
*Weight Painting
*New Bone Weighting Options
*Particle Collision Dynamics
*Better, Faster, Cleaner Global Illumination
*Translucency Scatter
*Ultra-Super Improved Hair
*New Licensing System
It seems it would be easier for Project messiah to support FBX than Unity to support what formats it does, I mean .fbx is supported by most major brands.
You might be able to use something like Ultimate Unwrap 3D with it to convert your .X file into a .FBX then import it into Unity.
I use this right from Autodesk Autodesk | 3D Design, Engineering & Construction Software its a converter, I use 3DS export and it converts nicely to FBX.
The problem with that is that none of the files it supports includes the animation data. I haven’t used Messiah but looking at it’s website I see that it can export .X files which do support animation data. UU3D does a very nice job of converting models and animations and the price is pretty darn reasonable.
Forgot about Ultimate Unwrap 3D
Will try that - plus sent email to Project messiah asking to support FBX.