I have a Windows 2008 domain in which Windows 2008 acts as an active directory, dns and dhcp server. I want to install Exchange in this environment. I don't have 64 bit Windows Server in my network so I can't install Exchange 2007. Just wondering if I can install Windows 2003 SBS in this environment which can act as a secondary domain controller with Exchange Server and ISA Server?

No - SBS must be the PDCe in the domain. Even creating secondary DCs is kind of pointless, as if your SBS system crashes, you need to rebuild it fresh unless you have a bare-metal backup/restore solution.

Glenn

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