Export the DHCP database from Windows 2003:
1. On the Windows 2003 DHCP server, navigate to a command prompt
2. Type the following Command: netsh
3. Type the following Command: DHCP
4. Type the following Command: server <\Name or IP Address>
5. Type the following Command: export c:\dhcpexportfile all

Note You must have local administrator permissions to export the data.

Import the DHCP database to the Windows 2008 DHCP server:
1. Copy the exported DHCP database file to the local hard disk of the Windows Server 2008-based computer.
2. Install the DHCP Role on the server.
3. Stop the DHCP server service on the server. To do this, follow these steps:
a. Log on to the target DHCP server using an account that is a local Administrator.
b. Click Start, click Run, type cmd in the Open box, and then click OK.
c. At the command prompt, type net stop DHCPserver, and then press ENTER.
d. Type exit, and then press ENTER.
4. Delete the DHCP.mdb file from c:windowssystem32DHCP folder.
5. Start the DHCP server service.
6. Right-click on the Command Prompt (cmd) and select “run as administrator”.

Note You must have local administrator permissions to import the data.
7. Type the following Command: netsh
8. Type the following Command: DHCP
9. Type the following Command: server <\Name or IP Address>
10. Type the following Command: import c:\dhcpexportfile
11. Restart DHCP and verify the database has moved over properly.