Many of today's cloud computing companies, like Amazon, Microsoft and Google, focus on attracting mid-size companies or the individual consumer with their cloud computing products. I.B.M., however, has decided to go after the big fish. By 2015, the world's largest computer company wants to bring in $7 billion in revenue from its cloud computing department alone. It's an ambitious goal that will force the company to attract big clients with innovative products. "I.B.M. is distinguishing its approach from rivals including Amazon.com Inc., Microsoft Corp. and Google Inc., which sell cloud services to independent software developers and larger companies based on the amount of time they use the services and how much data they consume."