In a country that’s known to have one of the hardest working society, workers at Microsoft Japan enjoyed an enviable perk this summer: working four days a week, enjoying a three-day weekend — and getting their normal, five-day paycheck. The result, the company says, was a productivity boost of 40%. Microsoft Japan says it became more efficient in several areas, including lower electricity costs, which fell by 23%. And as its workers took five Fridays off in August, they printed nearly 60 percent fewer pages.