UPDATE [dbo].[CMS_User]
  SET
	UserName=CONCAT('U',UserID),
	FirstName= CONCAT('U',UserID),
	MiddleName=NULL,
	LastName='Anoniem',
	FullName= CONCAT('U',UserID,' Anoniem'),
	Email=CONCAT('U',UserID,'@localhost'),
	UserPassword=CONVERT(NVARCHAR(32),HashBytes('SHA1', 'Super secret password'),2),
	UserPasswordFormat='SHA1'
  where UserName <> 'administrator'
    AND UserName<>'public'
    AND UserPrivilegeLevel<>3 -- skip global admins