Stories of Open Source Failures?

ahodgkinson asks: "We often hear about companies, government agencies, schools and other organizations that migrate from Microsoft to open source based systems. We sometimes hear about organizations that evaluate Open Source and then elect to remain with their existing proprietary system. Both of these events represent represent a 'non-failure' for the open source movement. I'm interested in knowing more about the Open Source 'failure' events, namely when organizations move away from open source to a proprietary solution. Does anyone know of organizations that have moved from an Open Source based IT solution (back) to a proprietary system? Or where such a move was contemplated but not made? I'm specifically interested in larger organizations that have 'undone' a strategic move to Open Source, and their reasons why. Given your examples, is there anything we can learn from them?"