no, you can use it.
you can't export back to the full version, however. you can import the full version file format.
So you can export to motionbuilder PLE from your maya, you just cant export back...

it should be noted, however...you can import maya files into the PLE...but you can only export the maya 7 PLE file format...you can reread it in your Maya if it's not PLE. But you can keyframe and...

go to 3dBuzz.com too...they have free video tutorials for Motionbuilder...covers importing/exporting to and from Maya, keyframing on layers, characterizing, user interface and customization,...

motionbuilder is real-time animation...with maya it slows down a lot when it has to calculate each keyframe, geometry, and everything else...motionbuilder is so smooth, it's...

Did you guys know the two are integrated? you can export from maya to motionbuilder and viceversa. It's pretty cool. I"ve been messing around with motionbuilder a bit.