Unfortunately for Microsoft, they've faced adoption issues with OneCare. It has not sold well, and is dwarfed by other competing suites from companies like Symantec and Trend Micro. Perhaps the update will address such issues, though it still seems that OneCare is out of place.
Microsoft is stretching themselves awful thin with the last few years endeavors, including a most recent rumor that they are planing to compete with Flickr. As they expand Windows Live, seemingly much faster than it should be, it seems they are trying to hype and sell more than people can take. Is there any market they could leave well enough alone?