Free upgrade Win10 official version FAQ

Today, Microsoft announced that the official version of Windows 10 will be released on July 29, when genuine Win7 and Win8.1 users can upgrade to Win10 for free. At the same time, Microsoft's official website also ushered in a revision, and answered some of the Windows 10 free upgrade related issues, as follows.

When will Win10 be launched?
Win10 will be released on July 29, 2015.
What is the significance of booking a free upgrade to Win10?
We will provide a free upgrade to Win10 for eligible Windows 7 SP1, Windows 8.1 updates and Windows Phone 8.1 devices for a limited time. This allows you to take advantage of this free offer and experience the system first after Win10 is released.
Can you really upgrade for free?
Yes. Win10 is a free upgrade to the qualifying Win7 SP1, Win8.1 update and Windows Phone 8.1 devices. This free upgrade is available for one year after the release of Win10. After the upgrade, you can enjoy Win10.
Which devices meet the free upgrade conditions?
Although our goal is to make most devices running Win7 SP1, Win8.1 updates and Windows Phone 8.1 meet the upgrade requirements, some hardware/software requirements will be set. And the availability of features may vary from device to device. The device must be connected to the internet and enable Windows updates.
Note: You may be required to pay for your ISP. Some versions are not included in the upgrade, including Win7 Enterprise, Win8/8.1 Enterprise, and Windows RT/RT 8.1. In addition to this offer, valid software subscriptions for Volume Licensing also guarantee customers the benefits of upgrading to Win10 Enterprise Products/Services. The ability to upgrade Windows Phone 8.1 devices to Win10 may vary by OEM, mobile carrier or host.