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Microsoft Security Essentials automatically checked and downloaded the latest virus definitions from Microsoft Update which was updated three times a day. [6] Users may alternatively download the updates manually from the Microsoft Security Portal website. [7]
Microsoft Anti-Virus for Windows (MWAV), included as part of the package, was a front end that allowed MSAV to run properly on Windows 3.1x. In 2009, Microsoft launched an in-house antivirus solution named Microsoft Security Essentials , which later was phased out in favor of Microsoft Defender .
Since its January 13, 2005, [2] Microsoft releases the updated tool every second Tuesday of every month (commonly called "Patch Tuesday") through Windows Update, at which point it runs once automatically in the background and reports if malicious software is found. The tool is also available as a standalone download.
The updates show up in Download Center before they are added to WU, and the KB articles are unlocked later. Daily updates consist of malware database refreshes for Microsoft Defender and Microsoft Security Essentials, these updates are not part of the normal Patch Tuesday release cycle.
The service delivers software updates for Windows, as well as the various Microsoft antivirus products, including Windows Defender and Microsoft Security Essentials. Since its inception, Microsoft has introduced two extensions of the service: Microsoft Update and Windows Update for Business .
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.
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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]