Redmond, Wash.--In a move that underscores both companies' long-term commitment to Internet marketing, Microsoft Corp. and Bank One Corp. have entered an expansive $30 million online advertising deal. Bank One, the sixth-largest bank in the U.S., will for at least the next three years buy advertising on Microsoft's MSN network of sites, and purchase Microsoft's Web alert and small-business software for implementation on the Bank One site. The deal includes a major b-to-b component, with Bank One integrating platforms from Microsoft's bCentral small-business site into its site.For Bank One, the deal gives it increased strength in small-business Internet banking, a niche it has been keen on developing since it shuttered WingspanBank.com, its consumer online bank, in June. (The WingspanBank brand was jettisoned and its operations were folded into Bank One's broader online offerings.) For Microsoft, the deal extends its reach into b-to-b online financial services, a market it's been developing since the 1980s. Microsoft also has major, longstanding technology deals with banks including Citigroup and Wells Fargo & Co.