See: tdwi.org
A recently released survey report on OSS adoption in large European companies tracks some very interesting trends. The Executive summary included this:
"In October 2008, Bull commissioned Forrester Consulting to evaluate the upcoming paradigm change of open source software enterprise adoption. In conducting in-depth interviews with 132 senior business and IT executives from large companies that are using open source products, Forrester found that these companies are embracing a fundamentally different understanding of software."
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