Asking why we use PDAs is like asking why we use laptops which eventually relates back to desktop computers.
PDAs allow you to carry the power of your desktop computer anywhere.
We use them because they are easy to carry places.
You wouldn't expect to see someone using a desktop pc in a meeting. It is more likely that he/she would be using a pda or a laptop.

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Jack Westerman
Jack@JackWesterman.co.uk