Despite external differences, most organizers run one of two operating systems, Microsoft's Pocket PC system or the Palm Operating System. Microsoft's Pocket PC system runs miniature versions of the Office application that you most likely use at work. It is also the only orgazining system that supports audio. The Palm OS is the easier to use and it can accept new and nifty applications that convert your organizer into cool gadgets like a digital camera or MP3 player. Two megabytes is the minimum, and ample for most casual users.
Rechargeable batteries are a convenience available on higher-end devices.
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