Hi , When I export any object with maya 2011 to fbx files and I import it with unity 2.6 it show me like a null object only the axis what’s the problem ?? please help me
Unity 2.6.1 is not compatible with Maya 2011 (to be more specific: FBX SDK 2010 is not compatible with FBX plugins 2011).
You can try exporting to FBX and set format to FBX2010 (but I know that there are know problems in that approach too). Unity 3.0 will use FBX SDK 2011.2.
yes , but their is another problem unity can’t support surface or nurbs it support only polygan object why ? and thanx for the reply
I do not know a realtime technology using nurbs but you are welcome to give an example 
In Maya there are tools to convert nurbsurface to polygon.
About FBX pluging I am using Maya 2009-64bit with "FBX 2011.3 " and it works good.
If you are using FBX exporter to import in unity, Maya version doesn’t mind.
but when I convert nurbs to polygan the models is not completely show in unity why?? thanks for all your replies 
It depends how many polygons you have on your model.
There is a limit of polygons when importing in Unity.
If you send to me your model in PV I can test it quickly if you want.
Be careful to also delete your History in Maya before exporting and to detach all connection from your model to the source, etc…