第一项始终是图钉的来源。总体可信度是各份资料对上方所用开始和结束时间支持程度的加权平均；资料每比最新的一份旧 180 天，权重减半。
已按日期发生，依据为该 pin 的描述：“Windows 8.1 发布日期。新增多款 Bing 应用……”
Microsoft's own news site confirms the rollout: "Beginning Oct. 17, consumers with a Windows 8 device in more than 230 markets and 37 languages can download the free update," matching the pin's stored 17 October 2013 date exactly.
Windows Central's headline, "Official: Windows 8.1 to be released on October 17th," backs the pin's date, though the article was published 14 August 2013, two months ahead of the actual release, as an early advance report rather than same-day coverage.
有遗漏或错误吗？用你自己的话说明：能佐证此图钉的链接、不同的开始或结束日期及理由，或缺失、有误的信息。AI 会对照此图钉的来源进行核实，搜索更好的来源，并添加任何支持你说法的页面。图钉自身的来源仍然最重要。AI 也会查看图片：显示的是别的东西或显示效果差的图片会被移到后面或替换。
原标题: Windows 8.1 Release Date
