Research in Motion, a Canadian company provided a PROPRIETARY operating system for BlackBerry.
The operating system provides support for Java MIDP 1.0 and WAP 1.2.
The current version supports NOVELL Group Wise and Lotus Notes.
Third-party SOFTWARE can be developed using BlackBerry APIs as well, with certain restriction functionality MUST be signed by RIM digitally, so that it can be associated to a developer account.