I imported Windows Internet Explorer 9 into WSUS using the Microsoft Update Catalog web page. I then approved the updates. All the Windows 7 machines installed the update correctly. The Windows Vista machines did not. When checking the WSUS Console, those machines have reported that the update is Not Applicable.
When I run Windows Update from a client machine, IE9 is not offered.
I am not sure what to do to make the Vista machines see the update as "Needed"