The Microsoft pop-up that pushes people to upgrade to Windows 10 violates the company’s own guidelines on Windows app design.

The technology giant recently altered the user prompt shown by the Get Windows 10 app to change how the close button works. Clicking X to close the prompt previously dismissed the scheduled upgrade to Windows 10, but Microsoft has changed its action, so clicking X now causes the user to agree to the scheduled upgrade.

The Get Windows 10 app automatically schedules an upgrade to Windows 10 for most Windows 7 and 8.1 users, which the user then has to reject.

A Microsoft spokesman confirmed that the clicking the close icon on the dialog box now has the same effect as clicking OK.

“If the customer wishes to continue with their upgrade at the designated time, they can click ‘OK’ or close the notifications with no further action needed,” he said.

The change seems to put Microsoft in breach of its own user experience guidelines for developers on the correct way to design dialog boxes.

In the guidelines, Microsoft states:

“The Close button on the title bar should have the same effect as the Cancel or Close button within the dialog box. Never give it the same effect as OK [TR emphasis].”

The Microsoft spokesman didn’t address why the firm had apparently broken its own guidelines with alterations to the Get Windows 10 prompt.

The change to the close button have been condemned by a number of commenters online. However, other sites have also pointed out the change to the prompt also adds a more explicit way to cancel the upgrade. The new prompt adds the words ‘Click here to change upgrade schedule or cancel scheduled upgrade’, albeit in the middle of the window. It also displays a suggested time and date when PCs will be updated to Windows 10.

The decision to alter how the close button works is not the first change that Microsoft has made to the Get Windows 10 app.

Microsoft has also been criticised for changing the status of the Windows 10 upgrade to a Recommended update. That change means that most Windows 7 and 8.1 machines, which by default are configured to install Recommended updates automatically, will schedule an upgrade to Windows 10, which the user then has to reject.

Earlier this month Microsoft announced that Windows 10 has been activated on 300 million devices — an adoption rate that, if it continues, would put the firm on track to hit its target of getting the OS onto one billion machines by July 2018.

More on Windows 10…