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Patch Tuesday (a.k.a. Update Tuesday〔(【引用サイトリンク】title=August updates for Windows 8.1 and Windows Server 2012 R2 )〕) is an unofficial term used to refer to when Microsoft regularly releases security patches for its software products. It is widely referred to in this way by the industry.〔(【引用サイトリンク】 Understanding Windows automatic updating )〕 Microsoft formalized Patch Tuesday in October 2003. Patch Tuesday occurs on the second, and sometimes fourth, Tuesday of each month in North America. As far as the integrated Windows Update function is concerned, Patch Tuesday begins at 18:00 or 17:00 UTC (10:00 PST (UTC−8) or 10:00 PDT (UTC−7). The updates show up in Download Center before they are added to WU, and the KB articles and the Technet bulletin get unlocked even later. Microsoft has a pattern of releasing a larger number of updates in even-numbered months, and fewer in odd-numbered months.〔(【引用サイトリンク】title=Microsoft Ready To Patch 34 Security Vulnerabilities )〕 Minor updates are also released outside Patch Tuesday. Daily updates consist of malware database refreshes for Windows Defender and Microsoft Security Essentials. Sometimes there is an extraordinary Patch Tuesday, two weeks after the regular Patch Tuesday. Some updates could be released at any time. == History == Starting with Windows 98, Microsoft included Windows Update that once installed and executed, would check for patches to Windows and its components, which Microsoft would release intermittently. With the release of Microsoft Update, this system also checks for updates for other Microsoft products, such as Microsoft Office, Visual Studio and SQL Server. Earlier versions of Windows Update suffered from two problems: # Less-experienced users often remained unaware of Windows Update and did not install it. Microsoft countered this issue with the Automatic Updates component, which displayed availability of updates, with the option of automatic installation. # Customers with multiple copies of Windows, such as corporate users, not only had to update every Windows deployment in the company but also to uninstall patches issued by Microsoft that broke existing functionality. In order to reduce the costs related to the deployment of patches, Microsoft introduced "Patch Tuesday" in October 2003.〔 〕 This system accumulates security patches over a month, and dispatches them all on the second Tuesday of each month, an event for which system administrators may prepare. The following day, informally known as "Exploit Wednesday", marks the time when exploits may appear in the wild which take advantage on unpatched machines of the newly announced vulnerabilities. Tuesday was chosen as the optimal day of the week to distribute software patches. This is done to maximize the amount of time available before the upcoming weekend to correct any issues that might arise with those patches. While at first glance Monday might appear to be an even better choice, Mondays can be occupied addressing other unplanned issues that might arise over the weekend. 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「Patch Tuesday」の詳細全文を読む スポンサード リンク
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