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support.microsoft.com /en-my /help /17150 /windows-7-what-is-microsoft-security-essentials Microsoft Security Essentials ( MSE ) is a discontinued antivirus software (AV) product that provides protection against different types of malicious software , such as computer viruses , spyware , rootkits , and Trojan horses .
Upon installation, Microsoft Security Essentials disabled and replaced Windows Defender. [41] [42] In Windows 8, Microsoft upgraded Windows Defender into an antivirus program very similar to Microsoft Security Essentials for Windows 7, [4] and it also uses the same anti-malware engine and virus definitions from MSE.
In a June 2006 Microsoft report, [2] 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.
On November 18, 2008, Microsoft announced the discontinuation of Windows Live OneCare, offering users a new free anti-malware suite Microsoft Security Essentials, which had been available since the second half of 2009. [2]
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