TechWeb | News | New IM Worms Hit MSN Messenger: "But another reason -- one less well-known, said Sakoda -- is that Microsoft's IM clients, and its network, can be accessed through APIs. 'They're embedded in the operating system, and allow experienced hackers a way to take over the MSN client.' The experience hackers have in breaking down Windows also helps explain the high number of IM worms that exploit Microsoft's clients and network."