DNS Migration - SBS 2003 to Windows 2003/2008 R2
Normally, we can use the following method to migrate DNS server:
1. Make sure the old DNS Server Zone type is Active Directory-Integrated. If not, please follow this article to convert it:
How To: Convert DNS Primary Server to Active Directory Integrated
http://support.microsoft.com/kb/816101
Note: Active Directory Integrated-Zone is available only if DNS server is a domain controller.
2. Install DNS component onwindows server 2008 and configure it as a DNS Server (Active Directory Integrated-Zone is preferred). All the DNS configuration should be replicated to the new DNS server with Active Directory Replication.
3. Make all the clients change TCP/IP configuration to point to new server as DNS. You may configure TCP/IP on all the clients, or adjust DHCP scope settings to make them use the new DNS server.
4. After ensuring everything works normally with the new DNS, you can demote the old one.
Additionally, I am not sure if this process is also identical to SBS server. Before you go any further, please also post in the following SBS queue to confirm this:
Windows Small Business Server 2003: