查看“Windows 10 Mobile:10.0.12671.40.TH1(wpbldlab).20150709-1700”的源代码

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{{Infobox Buildinfo
|image=WP-10.0.12671.40-about.png
|imagecaption=Windows 10 Mobile<br>10.0.12671.40.TH1(wpbldlab).20150709-1700
|kernel=Windows NT 10.0
|arch=ARM<br><abbr title="仅可作为 Visual Studio 2015 的一部分安装模拟器镜像。">x86</abbr>
|sku=MobileCoreProd
|language=Afrikaans (South Africa)<br>Albanian (Albania)<br>Amharic (Ethiopia)<br>Arabic (Saudi Arabia)<br>Azerbaijani (Latin, Azerbaijan)<br>Basque (Spain)<br>Bangla (Bangladesh)<br>Belarusian (Belarus)<br>Bulgarian (Bulgaria)<br>Catalan (Spain)<br>Chinese (Simplified, China)<br>Chinese (Traditional, Taiwan)<br>Croatian (Croatia)<br>Czech (Czech Republic)<br>Danish (Denmark)<br>Dutch (Netherlands)<br>English (United Kingdom)<br>English (United States)<br>Estonian (Estonia)<br>Filipino (Philippines)<br>Finnish (Finland)<br>French (Canada)<br>French (France)<br>Galician (Spain)<br>German (Germany)<br>Greek (Greece)<br>Hausa (Latin, Nigeria)<br>Hebrew (Israel)<br>Hindi (India)<br>Hungarian (Hungary)<br>Icelandic (Iceland)<br>Indonesian (Indonesia)<br>Italian (Italy)<br>Japanese (Japan)<br>Kazakh (Kazakhstan)<br>Khmer (Cambodia)<br>Kiswahili (Kenya)<br>Konkani (India)<br>Korean (Korea)<br>Lao (Lao P.D.R.)<br>Latvian (Latvia)<br>Lithuanian (Lithuania)<br>Macedonian (North Macedonia)<br>Malay (Malaysia)<br>Malayalam (India)<br>Norwegian (Bokmal, Norway)<br>Persian (Iran)<br>Polish (Poland)<br>Portuguese (Brazil)<br>Portuguese (Portugal)<br>Pseudo locale for east Asian/complex script localization testing, Pseudo locale used for localization testing, Pseudo locale used for localization testing of mirrored locales<br>Romanian (Romania)<br>Russian (Russia)<br>Serbian (Latin, Serbia)<br>Slovak (Slovakia)<br>Slovenian (Slovenia)<br>Spanish (Mexico)<br>Spanish (Spain, International Sort)<br>Swedish (Sweden)<br>Tamil (India)<br>Telugu (India)<br>Thai (Thailand)<br>Turkish (Turkey)<br>Ukrainian (Ukraine)<br>Uzbek (Latin, Uzbekistan)<br>Vietnamese (Vietnam)
|bios=2015-07-09
|timebomb=无
|string=10.0.12671.40.TH1(wpbldlab).20150709-1700
|key=无
}}

Windows 10 Mobile build 12671.40.TH1 是 Windows 10 Mobile （初始版本） 的预发布正式版。

2015 年 7 月期间微软曾向 OEM 厂商和软件开发商提供此构建。 原计划在 2015 年 7 月 29 日这天与 [[Windows 10 （初始版本）]] 一起公开发布， 但由于此系统整体存在稳定性问题， 最终被取消发布并推迟到[[Windows 10 Mobile#Threshold 2 (Version 1511, Original Release / 初始版本)|下一个 Windows 10 Mobile 手机操作系统的开发周期]]发布 [[Windows 10 Mobile:10.0.13053.0.TH2_RELEASE(winpbld).20151029-1700|Windows 10 Mobile （初始版本） 的正式版]]。

2015 年 8 月 6 日， 此系统在诺基亚 Lumia 930、 微软 Lumia 640 和微软 Lumia 640 XL 手机上的 <code>.ffu</code> 固件首次泄露在海外科技数码网站 XDA 的论坛上。<ref>[https://xdaforums.com/t/install-w10-mobile-build-10240-on-930-640-640xl-links-are-back-up-astoria.3173000/ Install W10 Mobile build 10240 on 930,640,640XL (links are back up) (Astoria) | XDA Forums]</ref>

2025 年 4 月 14 日， QQ 群聊 “WP特技研究所” 的多名成员在中国二手交易电商平台闲鱼上发现运行此系统的微软 Lumia 950 工程机， 其具体信息暂不明确。