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IT WAS bound to happen. One after another, pieces of software have been moving online in a trend towards “software as a service” (SaaS). You can now manage your e-mail, write documents and edit spreadsheets using online services that run inside a web browser. This month Intuit, the maker of TurboTax, an accounting program, said more Americans filled out their tax returns this year using the online version of its product than the traditional one in a box. But now the trend has reached the darker corners of the software universe. Computer-security firms say criminals have adopted the new model too, and are offering “crimeware as a service” (CaaS).