My small business has 2 desktop and 1 laptop in which I have installed Win7 activated with daz. Some days back I got emails from Microsoft appointed consultant that our company was nominated for SAM audit. I did not answer and their person came one day to check. They are now asking me to buy 3 licenses of Windows. Is this legal? Do I need to do this? They are asking for invoices to prove that Windows is legal. If I just say I have lost the invoices, can they prove the OS is pirated? Or should I buy the 3 licenses. The only good thing is that we don't use MS office by Libre so no problems there.