You are saying that you've got a production Windows NT Server that hasn't had to be rebooted for 4 years? So, this thing still has SP3 on it? Nobody bothered to install the NIMBDA server patches, or any other software fixpacks? Now, if you have been using a WinNT workstation, and you are utilizing the services of a UNIX server then I can readily believe that you haven't rebooted that UNIX server for 4 years.