With all of the time and money that companies devote to securing their IT systems, a single unsecured PDA presents a huge potential hole in a corporate security wall. Unfortunately, it is almost impossible to control what employees keep on their PDAs. Since most enterprises don’t budget for the latest mobile wonders, many devices in an organization are purchased personally by employees. With external cards capable of storing two megabytes of data, a variety of unsecured or proprietary data can be downloaded onto a device.