Microsoft has certainly been on a buying spree of late, and their latest acquisition is an anti-rootkit vendor Komoku. The purchase price has not been made public at this time, but it is expected that Microsoft will offer Komoku's technology to their enterprise customers as soon as possible and might open a few doors to security conscious organizations that have thus far shunned Vista.
"Komoku's customers include the Department of Homeland Security and the Department of Defense. Microsoft security division general manager Ryan Hamlin said in a statement that it was Komoku's work for "ultra security-conscious customers" that in part attracted his company to the deal."
It's also likely that Komoku's technology will eventually filter down into Windows Live OneCare.