This is the second time Microsoft s legal team has been actively involved in combating the botnet menace and they obviously learned from their previous attempt at trying to takedown the Waledac botnet. The criminals behind Rustock are only temporarily out of business. The malware they are using is still very successful at infecting their victims computers and the vectors they re using for causing the installation of malware upon those victims hasn t been touched. The Rustock botnet operators are adept at growing botnets so the loss of their CnC servers is likely only a temporary setback in the path of rebuilding.
Source: https://threatpost.com/lessons-rustock-takedown-032111/75048/