In this task, you are given a piece of an article. Your task is to generate a short summary of the text. Try to give the summary in just one sentence.

[Q]: Mobility is changing the way enterprises are buying, deploying and using unified communications, according to research firm Canalys.
[A]: A Clifton man died after he lost control of his car.

[Q]: Antonia Bird, one of Britain's leading female film and TV directors, has died of cancer aged 52.
[A]: Antonia Bird, one, has died of cancer aged 52.

[Q]: US President Barack Obama in an interview aired Friday said Russia must ''move back'' its troops from the Ukraine border and start negotiating, AFP reported.
[A]:
Barack Obama said Russia must move back its troops.