Comment Re:And... (Score 4, Informative) 296
Well, if you read TFA (no, I'm not new here) they have a sidebar call out that answers your question...
"Software licenses for productivity suites cost Toulouse 1.8 million euro every three years. Migration cost us about 800,000 euro, due partly to some developments. One million euro has actually been saved in the first three years. It is a compelling proof in the actual context of local public finance," says Monthubert.
So about 8K in migration costs vs. 18K in licensing. Assuming another 2-3K of unforeseen support over training issues or missing features that haven't been caught yet it should be a significant savings. And if you factor in the migration cost as a one time payment and assume support costs go down over time as people get used to the new system than the savings become very large indeed after the three years cited in the article.