I´m wondering if they are making:
A: client and server versions
B: server version
If its A, then they can spread this much faster than any other antispam tool out there, since they have Windows. It would probably also mean that they are working on other security issues aswell, which will make it harder to spread virus, spyware, dialers etc. to normal end users.
If its B, then this will only be one of many solutions to spam which is comming out, and this will leave spammers/mailers with more options.
However the message is clear... in 2006 most people will have somekind of anti spam tool with their mail address - and those making software "doctors" rich, and spammers poor