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再无机会！Windows 10免费升级通道关闭
source link: http://tech.sina.com.cn/it/2017-12-31/doc-ifyqefvw5093059.shtml
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原标题：再无机会！Windows10免费升级通道关闭[中关村在线新闻资讯]12月31日消息：微软在今天正式关闭Windows10免费升级通道，之后拥有正版Windows7和Windows8.1的用户想要升级到Windows10，只能花钱了。
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