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| status = Active | genre = Antivirus and network intrusion detection system | license = Freeware〔 | website = }} Microsoft Security Essentials (MSE) is an antivirus software (AV) product that provides protection against different types of malicious software such as computer viruses, spyware, rootkits and Trojan horses. Before version 4.5, MSE ran on , Windows Vista and Windows 7, but not on Windows 8 and later, which have built-in AV components. MSE 4.5 and later do not run on Windows XP. The license agreement allows home users and small businesses to install and use the product free of charge. It replaces Windows Live OneCare, a discontinued commercial subscription-based AV service, and the free Windows Defender, which until Windows 8 protected users from only adware and spyware. Built upon the same virus definitions and scanning engine as other Microsoft antivirus products, MSE provides real-time protection, constantly monitoring activities on the computer and scanning new files as they are downloaded or created and disabling detected threats. It lacks the personal firewall of OneCare or the centralized management features of Forefront Endpoint Protection. Microsoft's announcement of its own AV software on 18 November 2008 was met with mixed reactions from the AV industry. Symantec, McAfee and Kaspersky Lab—three competing independent software vendors—dismissed it as an unworthy competitor, but AVG Technologies and Avast Software appreciated its potential to expand the consumers' choice of AV software. AVG, McAfee, Sophos and Trend Micro claimed that the integration of the product into Microsoft Windows would be a violation of competition law. The product received generally positive reviews praising its user interface, low resource usage and freeware license. It secured AV-TEST certification on October 2009, having demonstrated its ability to eliminate all widely encountered malware. However, it lost the certificate on October 2012, having shown a constant decline in protection and repair scores. In June 2013, MSE achieved the lowest possible protection score, zero. According to a March 2012 report by anti-malware specialist OPSWAT, MSE was the most popular AV product in North America and the second most popular in the world, which has resulted in the appearance of several rogue antivirus programs that try to impersonate it. ==Features== Microsoft Security Essentials is an antivirus software (AV) product that fights malicious software (malware), including computer viruses, spyware, Trojan horses and rootkits. It replaces Windows Live OneCare, a discontinued commercial subscription-based AV service, and the free Windows Defender, which until Windows 8 only protected users from adware and spyware. It automatically checks for and downloads the virus definitions it relies on from Microsoft Update, a web-based software service updated three times a day.〔 Users may alternatively download the updates manually from the Microsoft Security Portal website.〔 On 30 September 2011, a faulty definition update caused the product to incorrectly tag Google Chrome as malware. The issue was resolved within three hours.〔〔 MSE originally ran on Windows XP, Windows Vista and Windows 7,〔 although versions 4.5 and later do not run on Windows XP〔 and Microsoft stopped producing definition updates for Windows XP on 14 July 2015.〔 MSE is built upon the same foundation as other Microsoft security products; all use the same virus definitions and anti-malware engine, known as Microsoft Malware Protection Engine (MSMPENG).〔〔 It lacks the personal firewall of OneCare or the centralized management features of Forefront Endpoint Protection.〔 MSE provides real-time protection, constantly monitoring activities on the computer and scanning new files as they are downloaded or created.〔 It disables detected threats and prompts for user input on how to deal with them. If no response is received within ten minutes, suspected threats are handled according to the default actions defined in the application's settings. Depending on those settings, it may also create System Restore checkpoints before removing the detected malware.〔 As a part of real-time protection, by default, MSE reports all suspicious behaviors of monitored programs to Microsoft Active Protection Service (MAPS, originally Microsoft SpyNet〔), a web-based service. If the report matches a newly discovered malware threat with an unreleased virus definition, the new definition is downloaded to remove the threat.〔 Hardware requirements for the product depend on the operating system. On a computer with Windows XP, it requires at least a 500 MHz processor and 256 MB of RAM. On a system running Windows Vista or Windows 7, it requires a 1 GHz processor and 1 GB of RAM. It also needs a computer monitor with a display resolution of at least 800 × 600 pixels, 200 MB of free hard disk space and an Internet connection.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Microsoft Security Essentials」の詳細全文を読む スポンサード リンク
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