O2 XDA
The O2 Xda brand was a range of Windows Mobile PDA phones, marketed by O2, developed by O2 Asia and manufactured by multiple OEMs (mainly HTC, Quanta and Erima). The first model was released in June 2002. The last models came to market in 2008. The "X" represents convergence of voice and information/data within one product; the "DA" stands for "Digital Assistant", as in PDA.
The first product released in the XDA range.
The successor to the Xda, the Xda II, was released in November 2003.
The Xda IIi was released in February 2005.
The Xda IIs was released in November 2004. O2 Germany released the device as Xda III.
The Xda IQ was released in 2005 and runs Windows Mobile 5 Smartphone Edition.
The Xda Exec was released in July 2005 and is the first Xda to run Windows Mobile 5, with highest speed processor at the time.
ROM upgrade available at [1] for UK/Irish users. Only released in Europe.
The Xda Mini S was released shortly after the Xda Exec, and was the second Xda to run Windows Mobile 5.
The Xda Atom is the latest Model to be released in Asia. It runs Windows Mobile 5 and has approximately the same dimensions as the Xda mini, but has much improved features.
The Xda Atom was released in Asia-Pacific region only.
The Xda Neo was launched by O2 Germany at the CeBIT show in March 2006. Its shape and size are very similar to those of the Xda II mini.
Announced in May 2006, it will be the second 3G-enabled model in the xda range. Like the Exec, it will have two CMOS cameras - a VGA camera on the front for video calls, and a 2-megapixel camera on the back. Other hardware specifications are very similar to the ones of the Mini S.
...
Wikipedia