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The Palm xv was the PDA that cemented Palm's dominance in this new device category. With the pictured Omnisky modem snapped onto its back, the Palm xv became the first handheld device with a connection to the new thing called the Internet. This combination was the first handheld method to get email on the go. I was one of the first mobile professionals able to get and respond to email from anywhere, thanks to the Palm xv and Omnisky modem. The data connection provided by the Omnisky was insanely slow and tremendously expensive, but it was the first of its kind.
The Apple Newton didn't last long, but it pushed the envelope in so many areas for mobile devices. The first device to offer true handwriting recognition, the Newton focused on intuitive input methods that competed with the constrained Graffiti input method used by Palm Pilots. The Newton was extensible with accessories such as modems and keyboards that turned the device into a full-fledged computer. There is an active Newton user community on the web even today, and the devices have even been hacked for Wi-Fi connectivity. You may have been impacted by the Newton handwriting recognition technology, as the team behind it went on to develop Evernote.
The E-125 was one of the first gadgets in Microsoft's Pocket PC product category, and it became a wildly popular PDA. The Casio was built like a tank and had features not found on any other product of its type at the time. The Casio E-125 would fit in a shirt pocket yet could handle a surprising spectrum of business tasks due to the rich support of the Microsoft Office platform.