If you need animation / bones, you will be in trouble.
If it's a static mesh (eg: a level mesh) I succeeded in export a .ma / .mb file into .lwo with deep exploration, then export it to .b3d with the Terabit's lwo converter.
If it's a static mesh (eg: a level mesh) I succeeded in export a .ma / .mb file into .lwo with deep exploration, then export it to .b3d with the Terabit's lwo converter.