Hi, I have a site running Windows 2000 and Exchange 2000, the backup software is Arcserve 2000 And anti virus is etrust.All of these products are installed with latest updates, but for some reason Exchange simply stops responding, once you reboot it works fine. At first I thought it might have been the maintenance of the private and public store, but having changed these it still happens. Any one else having this issue and if so, is there a fix ?