Dear All, We have ISA server installed on Windows2000 server in integrated mode. We use 3-homed config where the SMTP server (Exchange 5.5 SP4) is located on the internal segment. After publishing secure mail server, E-mail traffic works fine. Now we would like to use SMTP filter to kill emails with .vbs or .exe attachments in it. We proceed this config according the smtpfilter.htm document located on the ISA CD-rom \support\docs\smtpfilter.htm According this procedure (Config a remote SMTP Server) we should install the (Message screener) on the SMTP server. Now our SMTP server is installed on an WinNT4.0 SP6a operating system with Exchange V5.5 SP4 on it. ISA server 2000 CD-rom will not install any component because it is only for Windows2000 OS My question ? How can we install the (Message screener) from the ISA CD-rom on an NT4.0 machine? Thanks in advance with my best regards, Andre Coigne --- Panasonic/IT