Windows Umbriel build 5.5.2417.1

Windows Umbriel build 2417 was the first leaked build of Windows Umbriel. Being leaked on October 6, 2009. On October 6, 2009 a post was made on a website saying they had a build of Windows Umbriel even earlier than Build 2445. They said they got it on October 2, 2009 from an Ex-Microsoft Developer that worked on Neptune, Whistler (XP), Callisto, and Umbriel. And the Ex-Microsoft Developer had an early build of Umbriel on the official disk given to Beta Testers and Developers of Umbriel.