My domain is still running in Windows 2000 Native mode but I no longer have any Windows 2000 Server Domain Controllers. So I want to raise the functional level to Windows Server 2003. I have never done this before (obviously) so I wanted to get some feedback first. I have read over the help file and I didn't find what I am going to ask. When should one raise the level? Should I wait until after hours? Can I apply the change during hours? Will I have to reboot the server after doing this? Is there any thing I should know? Any ill affects? Any advise is appreciated. Thank you.