It's been a long time since Vista Beta testers have seen updates for Windows Defender. But finally on Tuesday, A new category for updates specified for the program appeared on the Windows Update site, the category for the updates has been classified under "Windows Products".
Along with that, another category named "Definition Updates" will be available for newly released definition updates for the program.
At the moment, Windows Defender is only available to Windows Vista testers and the updates will only become available to those who are testing Microsoft's new Update Service Pack 1.