The article was very brief and didn't cover what's next. Does the MS parent organization consider this a success, and are they going to repeat it in other countries or look at rolling out company-wide? It seems like it was a win-win from a business/employee perspective. Some metrics not mentioned that I would assume also trend in MS' favor would be increased employee retention and lowered HR/recruiting costs and lowered overhead costs on things like janitorial, lunchrooms, security (if they have a lower presence on weekends), etc. On the green side, it would be less gas & electricity for workers commuting one less day, and improve traffic, if only on a Friday. I would spring for 4 10-hour days in a heartbeat if so offered.