The MayaBullet plug-in automatically installs with Maya on Windows 64-bit, Mac OS, and Linux platforms. MayaBullet is not available for Windows 32-bit systems. Before using the MayaBullet for the first time, you need to load the plug-in using the Plug-in Manager. To do this:
In Maya, a Bullet menu is added to the Maya main menu bar and a Bullet item is added to the shelf. Use these items to access MayaBullet.
See MayaBulletPlugin.