Who are main customers of the BlackBerry? [originaltext]Blackberry sales have so

Blackberry sales have soared in recent months, but as Paula Hancocks now reports dependency on the device means some executives are often simply lost without it. What iPod is to music lovers, the BlackBerry is to executives. Hand held email access wherever you are has become the gadget you can’t be seen without. Addicted BlackBerry users earn the nickname CrackBerry. And “BlackBerry thumb” has entered the English language as a term for overuse.