I'm migrating from SBS 2008 to Win 2008 R2 Ent. When I deactivate DHCP on the SBS and active it on the New server The clients are not being assigned IP addresses. I have check the firewall on the new server and I've tried releasing the ip on the clients. I even change the time on the SBS to force the IP to expire in 15 min. Any help would be much appreciated.