Sources speaking with the Wall Street Journal say that U.S. regulators are looking into dealings between Microsoft and business partners that allegedly bribed foreign government officials in exchange for software contracts. An anonymous tipster informed regulators that a Microsoft exec at the company's China subsidiary told the tipster to offer kickbacks to Chinese officials in exchange for contracts, the Journal said. The tipster, a former Microsoft rep reportedly involved in a labor dispute with the company, brought his or her allegations to investigators in 2012. The accusations were also part of a 10-month 2010 internal investigation by Microsoft, which found no evidence of wrongdoing. Other dubious dealingsAlleged illegal dealings between Microsoft, Romania's Ministry of Communications and consultants in Italy are also under U.S. investigation.