When the Windows 7 Beta and RC versions were released,

Q: When was the Windows 7 Beta and RC versions released?
A: The highly anticipated Windows 7 Beta was released on January 9, 2009 (Beijing time) On January 10th, it was officially released and publicly tested for users around the world. The download for Windows 7 Beta is a DVD. This download includes both 32-bit and 64-bit versions for IT professionals and technology enthusiasts to test and feedback improvements.
With the launch of Windows 7 RC, Windows 7 Beta is also about to complete its mission, and will expire on August 1, 2009. In order to remind the IT professionals and technology enthusiasts who participated in the test to back up data as soon as possible and migrate to other operating systems as soon as possible, Windows 7 Beta will restart every two hours from July 1, 2009, expiring the test users. Warning; from the August 1st, 2009, the expiration date of the Windows 7 Beta license, the test user's test machine will restart every two hours and become a pure black desktop background. The user can change the desktop background color, but will change back to a pure black desktop background every 60 minutes.
Microsoft has been downloading Windows 7 RC (release candidate) from 11:00 am on May 5, 2009, including English, German, Japanese, Spanish, and French, excluding Chinese.
RC is short for Release Candidate, literally translated as a candidate, and in software terms a candidate version. The biggest difference between the RC version and the Beta version is that the Beta stage will always add new features, but by the time of the RC version, almost no new features will be added, and the main focus is on debugging. In other words, the Windows 7 RC version is almost identical in functionality to the official version. Users who download this RC can use it for free until June 2010.