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I'm an e-government consultant, and get this kind of question a lot.
It shouldn't matter what licencing model is attached to the software, what should matter is if it meets the requirements. These requirements are technical (does it work in our architecture), functional (does it perform the task we need it to do), and management and maintenance wise (what guarantees on service level, support, maitenance, training, etc. do we get) and implementation (can we get proof that this product does what we need, and that the implementor can do this?). Then you make a list of pros and cons, costs is just one factor in this equation.
The only thing you're asking from your company, is that they look at ALL available type of solutions, open ánd closed source.
Herko