In a move that could impact its sales among both consumer and business Mac users, Research In Motion announced that a BlackBerry Desktop Manager for Apple's Mac will be released on Friday. The free software syncs contacts, calendar appointments, and notes on a Mac with BlackBerry smartphones. The software works with Mac programs such as iCal, Address Book, Microsoft Entourage, and others. It also enables a user to schedule backups automatically, add or delete applications, encrypt backup files, and install software updates for the BlackBerry. Until now, BlackBerry Desktop Manager has only been compatible with Windows machines.