Windows Longhorn build 4033 (main) is a Milestone 6 build of Windows Longhorn, which was shared online on 23 May 2006.
The "Shut down" button on the login screen does not function, requiring the user to sign in to Windows or pressing the power button on the computer.
Safe Mode
By default, it is not possible to login while in Safe mode. Due to the login process change, the "User Profiles Service" and "Group Policy Service" services are required to access the login page and perform the login process respectively. Because these services are not configured by default to start within Safe mode, this results in logonui.exe showing the error "There are no more endpoints available from the endpoint mapper" on the login screen and failing to show available user accounts.