BlackBerry Ltd is very much alive, thank you, Interim Chief Executive John Chen affirmed in an open letter on Monday in which the smartphone maker committed itself to rebuilding as a niche player concentrating on the enterprise market. Chen took over as CEO a month ago after BlackBerry abandoned a plan to sell itself. In short, reports of our death are greatly exaggerated. BlackBerry, once the market leader in on-the-go email, has suffered a drastic loss of market share to Apple Incs iPhone and devices powered by Google Incs Android software. We know that BlackBerry devices are not for everyone.