(Telecompaper) Blackberry revenues for the fourth quarter fell to USD 464 million from 660 million the year before, pulled down by write-downs associated with recent acquisitions. The net result sank to a loss of USD 238 million or USD 0.45 per share, from a gain of 28 million or 0.05 per share, reflecting negative one-offs and amortisation, as well as pre-tax charges of USD 192 million related to restructuring and acquisition costs.