On Wednesday during a marquee Windows 10 event at Microsoft's headquarters in Redmond, the company officially announced a free upgrade offer for the latest operating system.

For the first twelve months following Windows 10's launch later this year, all devices running Windows 8.1 will get a free upgrade to the new OS. The same is true for phone devices running Windows Phone 8.1. In addition, everyone running Windows 7 will get a free upgrade to Windows 10.

Microsoft's Windows 10 event started at 9 AM PDT and will run for about two hours. The company started its briefing today by teasing that it may have a new hardware-related announcement to make, so you'll definitely want to follow along with our live-blog.

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