Microsoft released Windows 10 to the masses on Wednesday, giving the world an opportunity to update to its newest operating system.

Users of Windows 7 and Windows 8.1 who “reserved” a free update through the Get Windows 10 app will start to see a notification pop-up informing them that their update is ready for installation. The update is going out in waves, which means it’s likely that some users won’t actually get it today. In addition, the installer will check to make sure that a device’s apps and hardware are compatible with Windows 10, and will warn the user before proceeding or avoid installing altogether.

People who already have the latest pre-release build of Windows 10 installed won’t see another major update. Build 10240, which Microsoft released to members of the Windows Insider Program two weeks ago, is the same build that people who are upgrading from previous versions of the operating system will receive Wednesday. Terry Myerson, Microsoft’s head of operating systems and devices, said in a blog post announcing the roll-out that those people who already have the operating system installed should check to make sure that they have the latest patches applied.

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