I moved my w2k DC, with Exchange 2k and ISA server on it, to a different motherboard. To have the ACPI functional, I had to reinstall w2k, networking and IIS. After the reinstall of Xch2k, uninstall/reinstall of the ISA sp1, everything was working, but outgoing mail was delivered with a delay. Suddenly, it stopped delivering mail at all. All messages reside in SMTP queues. What could be missing? Does anyone have an idea? Thanks.