Microsoft today announced its acquisition of 
Giant Company Software, Inc., a provider of top-rated anti-spyware and Internet security products. Microsoft will use the acquisition to provide its customers with new tools to help protect them from the threat of spyware and other deceptive software. In addition, key personnel from Giant will be joining Microsoft's security efforts. Microsoft plans to make available a beta version of a spyware protection, detection, and removal tool, based on the Giant Anti-Spyware product, within one month for Microsoft customers.
Press release  Spyware Guidance