Research In Motion announced the immediate availability of BlackBerry Enterprise Server v4.1 and BlackBerry Enterprise Server-Small Business Edition v4.1 for Microsoft Exchange and IBM Lotus Domino. The latest versions of BlackBerry Enterprise Server build upon the manageability and power of BlackBerry as a platform for wireless communications and mobile access to corporate data. Incorporating feedback from thousands of enterprise customers across the globe, BlackBerry Enterprise Server v4.1 includes new functionality that makes it easier than ever to expand populations of BlackBerry users and manage larger scale deployments. The new release further expands wireless communications in the enterprise by providing tight integration with leading platforms for enterprise instant messaging, including Microsoft Windows Messenger, Live Communications Server 2005 and IBM Lotus Sametime.