Demote and remove the Source Server from the new Windows Server 2012 Essentials network
Updated: October 4, 2012
Applies To: Windows Server 2012 Essentials, Windows Server 2012 R2 Essentials
After you finish installing Windows Server 2012 Essentials and you complete the tasks in the Migration Wizard, you must perform the following tasks:
If you add user accounts after you move mailboxes to the Destination Server and before you uninstall Exchange Server 2003 from the Source Server, the mailboxes are added on the Source Server. This is by design. You must move the mailboxes to the Destination Server for all user accounts that are added during this time. Repeat the instructions in Move Exchange Server mailboxes and settings for Windows Server 2012 Essentials migration before you uninstall Exchange Server 2003.
You must uninstall Exchange Server 2003 from the Source Server before you demote it. This removes all references in Active Directory Domain Services (AD DS) to Exchange Server on the Source Server. You must have your Windows Small Business Server 2003 media to remove Exchange Server 2003.
To Uninstall Exchange Server 2003 from the Source Server
Log on to the Source Server as an administrator
Click Start, click Control Panel, and then click Add or Remove Programs.
In the list of programs, select Windows Small Business Server 2003, and then click Change/Remove.
In the Setup Wizard, click Next until the Component Selection page appears.
On the Component Selection page, expand Exchange Server, and then choose Remove.
Exchange Server will check to make sure that there are no mailboxes or public folders on the server. If any data remains, an error message appears when you click Remove. To avoid this issue, make sure that you have completed all of the procedures in the topic Move Windows SBS 2003 settings and data to the Destination Server for Windows Server 2012 Essentials migration.
When prompted, insert Windows Small Business Server 2003 CD#3, and follow the onscreen instructions.
Before you demote the Source Server, physically disconnect any printers that are directly connected to the Source Server and are shared through the Source Server. Ensure that no Active Directory objects remain for the printers that were directly connected to the Source Server. The printers can then be directly connected to the Destination Server and shared from Windows Server 2012 Essentials.
Before you demote the Source Server from the role of the AD DS domain controller to the role of a domain member server, ensure that Group Policy settings are applied to all client computers, as described in the following procedure.
The Source Server and the Destination Server must be connected to the network while the Group Policy changes are updated on the client computers.
To force a Group Policy update on a client computer
Log on to the client computer as an administrator.
Open a Command Prompt window as an administrator.
At the command prompt, type gpupdate /force, and then press ENTER.
The process may require you to log off and log on again to finish. Click Yes to confirm.
To demote the Source Server
On the Source Server, click Start, click Run, type dcpromo, and then click OK.
Click Next twice.
Do not select This server is the last domain controller in the domain.
Type a password for the new Administrator account on the server, and then click Next.
In the Summary dialog box, you are informed that AD DS will be removed from the computer and that the server will become a member of the domain. Click Next.
Click Finish. The Source Server restarts.
After the Source Server restarts, add the Source Server as a member of a workgroup before you disconnect it from the network.
After you add the Source Server as a member of a workgroup and disconnect it from the network, you must remove it from AD DS on the Destination Server.
To remove the Source Server from Active Directory
On the Destination Server, open Active Directory Users and Computers.
In the Active Directory Users and Computers navigation pane, expand the domain name, and then expand Computers.
Right-click the Source Server name if it still exists in the list of servers, click Delete, and then click Yes.
Verify that the Source Server is not listed, and then close Active Directory Users and Computers.
If you already performed this task before you started the migration process, continue with the section Remove and repurpose the Source Server.
If your Source Server is running the DHCP role, perform the following steps to move the DHCP role to the router.
To move the DHCP role from the Source Server to the router
Turn off the DHCP service on the Source Server, as follows:
On the Source Server, Click Start, click Administrative Tools, and then click Services.
In the list of currently running services, right-click the Windows Server, and then click Properties.
For Start type, select Disabled.
Stop the service.
Turn on the DHCP Role on your router
Follow the instructions in your router documentation to turn on the DHCP role on the router.
To ensure that IP addresses issued by the Source Server remain the same, follow the instructions in your router documentation to configure the DHCP range on the router to be the same as the DHCP range on the Source Server.
If you have not set up a static IP or DHCP reservations on the router for the Destination Server, and the DHCP range is not the same as the Source Server, it is possible that the router will issue a new IP address for Destination Server. If this happens, reset the port forwarding rules of the router to forward to the new IP address of the Destination Server.
Turn off the Source Server and disconnect it from the network. We recommend that you do not reformat the Source Server for at least one week to ensure that all the necessary data migrated to the Destination Server. After you have verified that all the data has migrated, you can reinstall this server on the network as a secondary server for other tasks, if required.
After you demote and remove the Source Server, restart the Destination Server.
After you demote the Source Server, it is not in a healthy state. If you want to repurpose the Source Server, the simplest way is to reformat it, install a server operating system, and then set it up for use as an additional server.