Yes, it is possible to rollback a server feature that has been installed in Windows Server. Here are the steps to do it:

1. Open the “Server Manager” on the Windows Server.
2. Select “Manage” from the top menu and click on “Remove Roles and Features.”
3. A “Before You Begin” screen will appear, click “Next.”
4. Select the server from the server pool that you want to remove the feature from and click “Next.”
5. From the “Remove Roles and Features” screen, select the feature you want to remove and click “Next.”
6. On the confirmation screen, click “Remove.”
7. The feature will now be uninstalled from the server.

Please note that some features may require a restart of the server after they have been uninstalled. It is also important to ensure that removing a feature will not affect any other functionality or applications on the server before proceeding with the uninstallation.