Deutsche Telekom AG told a Hannover Fair audience yesterday it expects profits to double this year and that it will expand co- operation between its T-Online service and Microsoft Corp. Chairman Ron Sommer said net profit at the parent company rose 23% to the equivalent of $938m last year, assuring the dividend. Group net profit will, of course, be higher than this, he said. Sommer declined to give details about 1996 group results before the planned annual news conference in May, but said the first months of 1997 showed that the company was on track to meet its forecasts and to pay a dividend of 1.20 marks for 1997.