This is the hair cut on licences
M$ and the PRC had a dispute on how much the chinese central and local government would pay for the privilege to use Windows and Office. This is the rebate they "negotiated"
According to an earlier article (http://www.theregister.co.uk/2014/07/29/china_microsoft_monopoly_probe/) the government was to "spend millions" on licences. Now they have the money