Windows Defender is a freeware program designed to protect against spyware and other unwanted software.

Windows Defender (Beta 2) was released on February 13, 2006.

There no difference between this and Microsoft's Windows Defender.

Windows Defender An antispyware program with several real-time protection agents.

Windows 8 ships with an updated version of Windows Defender.

The company also points out that Windows Defender itself is still in beta testing, and will steadily improve.

And the problem is, Vista's Windows Defender scans incoming stuff without user intervention.

There was nothing that was only Vista except Windows Defender.

So you can't argue that there was lots of legacy code in Windows Defender.

According to a support article on the site, older versions of the program will be automatically removed when you install the new Windows Defender.