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LONDON, Nov 21 (Reuters) - Sony (6758.T) must face a mass lawsuit worth up to 6.3 billion pounds ($7.9 billion) over claims the PlayStation maker abused its dominant position leading to unfair prices for customers, a London tribunal ruled on Tuesday.

Sony Interactive Entertainment (SIE) was sued last year on behalf of nearly 9 million people in the United Kingdom who had bought digital games or add-on content through Sony's PlayStation Store.

Dont Microsoft do the same thing? 

DDon't Microsoft do the same thing?D