By Alastair Sharp TORONTO (Reuters) - A tentative deal to take BlackBerry Ltd private will not necessarily resolve challenges that pushed the smartphone maker into a corner in the first place, but it gives the struggling company some breathing room. Private or public, BlackBerry's problems remain the same: slumping market share, mostly uninspiring devices and cut-throat competition threatening the state-of-the-art security of the BlackBerry network. ...



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