IRS started a tax investigation in 2007 of Microsoft's 2004-2006 tax returns, which has been somewhat exposed to the public due to the lawsuits along the way.

IRS started a tax investigation in 2007 of Microsoft's 2004-2006 tax returns, which has been somewhat exposed to the public due to the lawsuits along the way. https://www.seattletimes.com/business/microsoft/microsoft-irs-going-to-court-over-longtime-tax-scrutiny/ https://www.seattletimes.com/business/microsoft/microsoft-ir...