 The reporting behavior is disclosed in the tool's EULA, and can be disabled if desired.In a June 2006 Microsoft report, the company claimed that the tool had removed 16 million instances of malicious software from 5.7 million of 270 million total unique Windows computers since its release in January 2005.The report also stated that, on average, the tool removes malicious software from 1 in every 311 computers on which it runs.