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When you upgrade your computer from Windows 2000 to Windows XP and the Guest account is enabled for local logon, the Guest option is available when you run the Out of Box Experience (OOBE). You are able to log on as a Guest without using a password.
This behavior can occur because the sharing and security model does not change during the upgrade. The status of the Guest account (enabled or disabled) is not affected, and the Guest account is neither added nor removed from "interactive logon" or "deny interactive logon."
OOBE is the wizard that usually runs after Setup and performs the followingfunctions: