After Putting a model in unity from Blender it sais:
Blender could not convert the .blend file to FBX file. You need to use Blender 2.45-2.49 or 2.58 and later versions for direct Blender import to work.
Note that i have Blender 2.71 UnityEditorInternal.InternalEditorUtility:ProjectWindowDrag(HierarchyProperty, Boolean) UnityEditor.DockArea:OnGUI()
Found out you go to :
FILE/Export and choose