“The 64-bit version of the directory synchronization tool is now available. The 64-bit version now uses Forefront Identity Manager (FIM) 2010 as the underlying synchronization engine. FIM is installed silently when you run Setup.
The 64-bit version of the directory synchronization tool shares exact functional parity with the existing 32-bit software. Therefore, refer to the existing directory synchronization documentation for all other deployment and configuration information. “