TORONTO If you bought a PC between 1998 and 2010, chances are it came with Microsoft products already installed. And if it did, you could be eligible to get back hundreds of dollars without proof of purchase. A class-action lawsuit alleges that Microsoft and Microsoft Canada inflated prices and were engaged in anti-competitive behavior. As a result, Canadians are now eligible to get back up to $250, without a receipt, for PC versions of Microsoft software they purchased individually or that came pre-installed on computers. “It almost sounds too good to be true, but it is legit,” said Carmi Levy, a tech expert and director with Info-Tech Research Group of London, Ont.