Mr. Schmidt snared the C.E.O. spot at Google and today finds himself at the helm of one of computing’s most inventive and formidable players, the runaway leader in Internet search and online advertising. With its ample resources and eye for new markets, Google has begun offering online products that strike at the core of Microsoft’s financial might: popular computing tools like word processing applications and spreadsheets.

Google introduced a package of online software offerings, called Google Apps, that includes e-mail, instant messaging, calendars, word processing and spreadsheets. They are simpler versions of the pricey programs that make up Microsoft’s lucrative Office business, and Google is offering them free to consumers.

New features and improvements are made and tested on Google’s computers and constantly sprinkled into the services users tap into online.