The number of workers at Microsoft that are now using Windows 10 as their primary operating system is well over 95%, a mark hit in less than 10 weeks after the company launched it on July 29. Microsoft recently posted a research study on their deployment of Windows 10 in their business that shows how their in-place update system made the transition for their roughly 120,000 employees much faster compared to older Windows updates.
When Windows 7 launched in 2009, it took a year for the update to reach 80% of Microsoft's employees, using a custom installation image. For Windows 8's launch in 2012, Microsoft created its own Windows Installer front-end application to speed up the update process for its workers, but it still took 8 months for the update to reach 85% of its team members.
The company piloted an in-place upgrade system for Windows 8.1's launch in 2013. The paper stated:
The in-place upgrade was also used for Windows 10 and it managed to complete the upgrade process for 85% of its employees in just four weeks and 95% inside of 10 weeks, which was the goal of the IT team. It was helped by the fact that prior to Windows 10's release, a large number of employees were already using Insider preview builds:
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