BlackBerry Enterprise Server (BES) is the middleware software package
        that is part of the BlackBerry wireless platform from Research In
        Motion®.
        BES software and services connect to SAP Mobile Platform on the corporate LAN and redirect data
        sent by SAP Mobile Server.
BES uses Windows services to carry out the basic
            operations of the system. While many services exist, these are the ones
            you
            can use with
                SAP Mobile Platform:
- BlackBerry Messaging Agent  – Performs
                        wireless calendar synchronization, generate initial encryption keys, or
                        provide email and lookup services. 
 - BlackBerry MDS Connection Service – Pushes
                        requests from
                        intranet
                        applications. The BlackBerry MDS Services (for Apache Tomcat) sends and
                        receives Web browsing to the device through a BlackBerry Dispatcher service.
                        You can use these services for
                            SAP Mobile Platform
                        data flow with third-party Java applications on-device. 
 - BlackBerry Policy Service –  Pushes wireless IT policies to devices, sets commands for
                        device locks and remote
                        wipe,
                        and generates new encryption
                        keys. 
 - BlackBerry Router  – Routes all SAP Mobile Platform data to wireless devices by establishing
                        a link between BES (which can be installed on the same host as the router)
                        and SRP
                        host.
 - BlackBerry Synchronization Service –  Performs OTA backup and synchronization of all PIM data
                        (contacts, tasks and
                        notes),
                        except
                        calendar,
                        which is instead performed by BlackBerry Messaging
                        Agent.
 
 
For information about any of these or other services, see the BES documentation
            at  http://docs.blackberry.com/en/ .