Can I run Exchange 2010 CAS role and Remote Desktop Gateway and VPN in DMZ?

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http://serverfault.com – Our environment has a server running Hyper-V. We've virtualized our Remote Desktop Gateway and VPN (sstp.. remote acces server) on VM#1. We want to virtualize our Exchange to VM#2. We only have one IP and port 80 and 443 are directed to VM#1. Port 25 is directed to VM#2. There is no TMG/ISA. No reverse proxy either. We have a SAN/UCC SSL Certificate from a third party for: - mail.ourdomain.com - autodiscover.ourdomain.com - exchange.ourdomain.local <-- VM running Exchange mailbox and hub transport roles. - remote.ourdomain.local <-- VPN/RDP access. Can anyone suggest how to get (HowTos)