Chen took over as CEO a month ago after BlackBerry abandoned a plan to sell itself.

"Our 'for sale' sign has been taken down and we are here to stay. In short, reports of our death are greatly exaggerated," he wrote in the letter that was addressed to "valued enterprise customers and partners".

BlackBerry, once the market leader in on-the-go email, has suffered a drastic loss of market share to Apple Inc’s iPhone and devices powered by Google Inc's Android software. Its new smartphones have so far failed to win back customers, as Chen acknowledged in the letter.

"We know that BlackBerry devices are not for everyone. That's OK," he said.

BlackBerry has laid off thousands of workers over the last two years and it said in September that it would shed more than a third of its global workforce and refocus itself on the enterprise market, large business and government clients.

"We're going back to our heritage and roots, delivering enterprise-grade, end-to-end mobile solutions," said Chen.

"The investments you've made in BlackBerry infrastructure and solutions are secure. I will keep the lines of communication open as we navigate through this transition,” added Chen.

BlackBerry shares were up 5 Canadian cents at C USD 6.76 on the Toronto Stock Exchange on Monday, just above the record low of C USD 6.25 hit two weeks ago, and at just a fraction of the stock's record high of C USD 150.30, hit in 2008, when the company dominated the smartphone market.

Rather than selling itself, BlackBerry said early last month that it would raise USD 1 billion in a convertible notes offering led by Fairfax Financial Holdings Ltd, its largest shareholder.


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