To take one example, only government entity that I know that don't outsource email would be the military, and even there I doubt the in-house use is 100%.
Coase’s writings and teachings lead directly to the idea of accounting for all costs in any business or outsourcing endeavor, or “Total Cost of Ownership.”
That's just an example of "vested interests" proving that outsourcing is not all rainbows and unicorns.
In house has no budget for this, we rely on the public space and academia for validation and fair insight. It's telling that Coarse was active from the 30's to the 70's as was J.K. Galbraith who wrote about the technostructure. Managerial capitalism has been slaughtered, bits of it are flopping around weakly. It seems to me that the neo-liberal replacement has helped billions out of poverty in China, India, Indonesia and so on, but this is an unstable situation. It's not clear that the greater good can continue to be served if the economies of the west cannot be reconstructed to provide far larger numbers of stable, interesting and reasonably well paying jobs. Neo-liberalism has failed in that sense and seems not to have anything to say about it apart from "tough, you lot had it too good for too long and now you have to be as rich or poor as people in India and China." Which implies dictatorship.
The problem is of course lack of knowledge. They don't understand how important it is and that it is one of societies most critical infrastructure today.
Hopefully this incident will be a lesson to politicians and government agencies to care more about security and IT in general.
[1]: http://www.sakerhetspolisen.se/publikationer/fallstudier-och...