The Federal Tax Identification Number for Microsoft
The Federal Tax Identification Number for Microsoft is 91-1144442. The Federal Tax Identification Number is used for tax purposes. Customers can also obtain this number by calling Microsoft Consumer Sales at (800) 426-9400.
June 18, 2019—KB4501371 (OS Build 17763.592) - Microsoft Support
Learn more about update KB4501371, including improvements and fixes, any known issues, and how to get the update.