maybe he isn't allowed to install programs, if it's his PC computer at work - that's common practice in many companies.
IE 10 is one of the major browsers, so by not supporting it BB makes quite a big mistake!
Größter Knecht aller Zeiten aka His Excellency aka President for Life aka Field Marshal Al Hadji aka Lord of All the Beasts of the Earth and Fishes of the Seas aka aka Conqueror of the Buzzerbeater Empire in Europe in General and Austria in Particular