Microsoft's Windows 10 upgrade notifications have been the subject of amusing weather forecasts, a $10,000 lawsuit, and generally annoying for many other people. While Microsoft is tweaking the regular upgrade prompt to make it less confusing for existing Windows 7 and Windows 8.1 users, the software giant is also preparing one last push to convince people to upgrade to Windows 10.

Microsoft's free Windows 10 upgrade disappears after July 29th, and in the final days before the offer ends Microsoft is using a full-screen prompt to get people's attention. The prompt will say "sorry to interrupt," before noting that the Windows 10 free upgrade offer ends on July 29th. Windows 7.1 and Windows 8.1 users receiving the prompt will be able to upgrade immediately, remind later, notify three more times, or simply do not notify again. Not everyone will see the prompt, and Microsoft notes if existing users have the latest "Get Windows 10" app they won't see the full-screen prompt.

If an existing machine is incompatible Windows 10, has been upgraded to the latest OS and uninstalled, or failed to upgrade to Windows 10 then these users also won't see the full-screen prompt. Existing methods to block the Windows 10 upgrade prompts will also suppress this new full-screen notification. Microsoft is planning to charge $119 to upgrade to Windows 10 from July 30th onward, and the company is urging all Windows 7 and Windows 8.1 users to take advantage of the free upgrade over the next few weeks.

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