In http://msdn.microsoft.com/en-us/library/aa394389%28v=VS.85%29.aspx the end of support is listed. That's why this WMI class is disabled by default in Lansweeper Item wait time list.
Requirements:
Minimum supported client: Windows XP
Minimum supported server: Windows Server 2003
End of client support: Windows XP
End of server support: Windows Server 2003 R2