Prior to the launch of Windows 10, Microsoft opened up the Windows Insider program and they are now saying that over 1 million users have signed up to access the Windows 10 technical preview.



From Neowin:

Seeing that likely everyone who signed up for the program also downloaded the bits, it's likely safe to say that there are over 1 million users playing with Windows 10. Yes, we know that you can access the direct links and bypass the program and there are also those toying with the Enterprise SKU too, but it is safe to say that there are at least 1 million installs of Windows 10 around the world.

Microsoft has also said that they have received a plethora of feed back too; over 200,000 pieces of user-initiated feedback submitted via the Windows Feedback app.

  Microsoft: Over 1 million users are helping test Windows 10