If its for an older version of maya try exporting out as an fbx, one of the older versions that the olde version of maya supports.
If not try obj and then re-map the textures in the older version.
Or you can hack a ma file to an older version as long as theres nothing that you have used in the new version that the old one does not have.
Hope it helps
Steve
"No pressure, no diamonds" Thomas Carlyle