BlackBerry OS is the proprietary software platform made by Research In Motion for its BlackBerry line of handhelds. BlackBerry OS provides multi-tasking, and makes heavy use of the device's specialized input devices, particularly the trackball or touchscreen. The OS provides support for MIDP 1.0 and WAP 1.2. Previous versions allowed wireless synchronization with Microsoft Exchange Server's e-mail and calendar, as well as with Lotus Domino's e-mail. The current OS 4 provides a subset of MIDP 2.0, and allows complete wireless activation and synchronization with Exchange's e-mail, calendar, tasks, notes and contacts, and adds support for Novell GroupWise and Lotus Notes when used in conjunction with BlackBerry Enterprise Server.

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