If your environment is like mine, you may be forced to manage some legacy systems with Configuration Manager, some of which may be running older operating systems like Windows Server 2003.
You may also find that the SCCM client refuses to install on Server 2003.
Luckily, the fix is easy enough. The SCCM client requires BITS 2.5 to be installed as a prerequisite. You can download BITS 2.5 for Windows Server 2003 here.
After downloading and installing BITS 2.5 on your Windows Server 2003 systems, you should be able to deploy the SCCM client without a problem.