RIMM built its strength in
the corporate market, with 'push-email' offerings. It uses
BlackBerry Enterprise Server
(BES) a middleware
software package that is part of the BlackBerry wireless platform. BES connects to messaging and collaboration software (Microsoft
Exchange,
Lotus Domino,
Novell GroupWise),
on enterprise networks, and synchronizes email and
PIM
information between desktop and mobile software. With BES, the BlackBerry device becomes an extension of the desktop, with messages delivered nearly instantaneously, and calendar and contact changes synchronized between the device and the server as they are made.