Microsoft has decided to disable a 17-year-old video codec in older versions of Windows rather than patch multiple vulnerabilities, according to the company's security team.
The update targets only the oldest editions of Microsoft's operating system: Windows 2000, Windows XP and Windows Server 2003. Windows Vista, Windows 7 and Windows Server 2008 already bar the Indeo codec from loading. Intel introduced the codec in 1992.
You can read the article here. I'm sure that at some point, with some client this will be an issue.