1: https://joinup.ec.europa.eu/news/tco-should-include-exit-cos...
If say Windows XP just gets phased out on you that's not exactly cause for celebration either. And of course there's also the advantage that you can at least theoretically check most of the source code of Linux which is probably somewhat relevant in a government setting (a potential NSA cooperation of Microsoft says hi)
Ubuntu in particular are bad at keeping things the same between (LTS) revisions - so many times when you google to fix something, there's different instructions for each of the past X releases.
If they're able to calculate the TCO difference, they most certainly had the numbers, right? Or perhaps the story wouldn't have been quite as compelling if they published the specific numbers they used to calculate "TCO".
Also, are we to believe that the replacement apps are fully as good as the commercial alternative? MS Excel is not superior in any way to the open source alternative? There most certainly is a cost associated with productivity, far beyond desktop maintenance costs in many cases.
Considering that the police are using this software and their requirements are email and office apps then they don't need a lot of functionality. Hell you can use Google Docs and it would suffice.
Why would that be a requirement? Take any two things that aren't identical and each of them will be better than the other at something. You're assuming the comparison on net would favor Microsoft. For example, here's a short list of commands: grep, awk, sed, ssh, scp, rsync, wget, nc, dig, du, sort. These programs are not superior in any way to the Microsoft alternative?
Regardless, I'm not even suggesting who necessarily wins, I am saying it is a very important consideration that should be considered if you are truly trying to calculate an accurate TCO comparison.
For example, the hardware+software-only costs of a run-of-the-mill Windows+Office enterprise desktop, for a large corporation, might be $1,200 over three years, but the TCO could easily top $4,000 or even $5,000 a year. (If these figures seem high to you, think about the cost of training thousands of individuals about as computer savvy as your Aunt Tillie, and then having to troubleshoot all their virus infections, messed up files, one-off application bugs, unrepeatable weird crashes, etc. so they can do their work every day.)
The Gendarmerie, in other words, is claiming that the switch to Ubuntu Linux on the desktop is saving them somewhere between one and two thousand dollars a year per seat. With 72,000 desktops, the aggregate savings are probably in the mid-to-high tens of millions of dollars a year.
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[1] http://www.gartner.com/id=2371417