I want to install Exchange 2003 as a mulitforest deployment but the Exchange server in the US is running 5.5 SP4. How would I go about this??? I only need the GAL from the USA + we have .com email addresses so our mail is routed through them. Is this something MIIS could help with? and if so could I just use the Feature pack. Would someone pls confirm this or provide the correct information. Thanks. Brett