This is on SkyNews business section and according to the report, Microsoft have offered this software FREE as they believe too many either wont or cant afford suitable Anti Virus/Spyware software and so they decided to make this available.
the article claims this is the same technology the Global software Giant uses in security programs it designs for businesses.

The article has no details as to what systems this will work with or any restrictions on its use.

As usual, Caveat Emptor rule applies here.