Unity natively imports Maya files, supporting the following:
Unity does not support Maya’s Segment Scale Compensate setting on joints.
You need to have Maya installed to import .mb and .ma files directly into Unity. If you don’t have Maya installed, use the .FBX format instead. For more information about importing FBX files, see Importing models.
When Unity imports a Maya file, it launches Maya in the background. Unity then communicates with Maya to convert the .mb file into a format Unity can read.
The first time you import an .mb or .ma file into Unity, Maya has to launch in a command line process. This can take a while, but subsequent imports are very quick.
When exporting blend shapes from Maya:
When you’ve imported the .mb file into Unity, select it in the Project window and enable Bake Animations in the Animations tab of the Model Importer.