Microsoft Exchange System Attendant (SA) is software that provides monitoring, maintenance, and directory lookup services in Exchange Server. SA includes a collection of subcomponents that work together to proxy Active Directory requests and regulate internal Exchange Server functions.
Exchange System Attendant is based on a primary executable file that runs as a service and a number of subcomponents that allow SA to perform various tasks. The main executable file is the MAD.EXE file, located in the Exchange server's Program Files\Exchsrvr\Bin folder. However, most of the subcomponents exist as .DLL files.