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| Windows 10 Build 9903 | |
| Kernel version | 10.0 |
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| CPU architecture | x86, x64 |
| Edition | Technical Preview |
| BIOS date | December 4, 2014 |
Windows 10 build 9903 (with a build tag of 9903.winmain prs.141204-1736) is a pre-release build of the Microsoft Windows 10 operating system. This build leaked on January 26, 2015.
