Microsoft Details on Expiration Dates For Windows 10 Technical Preview

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What happens when your Windows 10 Technical Preview gets expired? According to Microsoft a detailed explanation on expiration dates related to Windows 10 Technical Preview was released.

The expiration dates for Windows 10 Technical Preview vary by build number.  The table below summarizes the expiration dates for each of the builds Microsoft released so far. Microsoft further said that the dates were subject to change. I have given you reasons why you should upgrade to Windows 10 right now and the steps on how to downgrade from Windows 10 and also on how to Install Windows 10 in a Virtual Machine on Windows/Mac/Linux OS

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Approximately 2 weeks before a build’s license expires, you will start getting warnings that this build will expire and that you should update to the most recent build.
When the build reaches the license expiration date, the system will automatically reboot every three hours.

Approximately 2 weeks after the license expires, the build will no longer boot at all.

If you are still on an older build and are getting expiration warnings, it is likely that Windows Update is failing to install the latest build automatically.  To resolve the problem, download the latest ISO file from http://windows.microsoft.com/preview-iso-update.  After the download is complete, double-click the ISO file to mount it and then launch setup.exe.
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If Windows has stopped booting due to an expired license, to resolve the issue you’ll need to download the ISO file from another computer and then transfer the ISO file to installation media such as a USB flash drive or DVD.   Then boot the PC from the installation media to install the latest build of Tech Preview.