BlackBerry Enterprise Server

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BlackBerry Enterprise Server designates the middleware software package that is part of the BlackBerry wireless platform supplied by Research In Motion (RIM). The software and service connects to messaging and collaboration software (Microsoft Exchange, Lotus Domino, Novell GroupWise, Alt-N MDaemon) on enterprise networks and redirects emails and synchronize contacts and calendaring information between servers, desktop workstations, and mobile devices. Some third-party connectors exist, including Scalix, Zarafa, Zimbra, and the Google Apps BES Connector, although these are not supported by RIM.

Source: Wikipedia