I came across this interesting blog on ZDNet by enterprise consultant Oliver Marks describing General Electric's internal collaboration network.
The company's "SupportCentral" network is probably the most advanced internal enterprise cloud in the world today, with more than 400,000 users worldwide generating 25 million hits per day. That's more than Yahoo and Google combined, and the company says it is able to maintain the cloud for less than the hosting cost of Amazon's S3 service.
GE workers are able to keep in touch through their own profile pages, which provide access to a shared Web storage system that serves as an online file and document repository. The company says it has virtually eliminated desktop office suite licenses for individual employees.
GE brass is so convinced of the millions that the system has saved the company that they haven't even bothered to do a formal ROI analysis.