Why not Linux for Security? Sure, okay, but what will run? Let's take the example of a small law office that bills by the hour. You have several needs . . .
1. Document Assembly. If your document assembly software is running on Windows, you're not going to migrate to Linux. Ever. Never EVER.The learning curve means lost revenue.
2. Time and billing. These take time to set up, they work with #1 above, and they usually work best on Windows.
3. Practice management. Once again, usually Windows only, or Windows best, and they work with #1 and #2 above.
4. Accounting and taxes. Quickbooks Enterprise works with Linux, but not the smaller packages. Also, there's not Turbotax Business for Linux.
I know a lot of people who would love to experiment with Linux, but it would be experimenting. A lot of people don't have time to experiment, and certainly don't want to pay someone to experiment. If you do everything yourself, there's a learning curve, and in a lot of industries there's a constant learning curve with new legislation, case law, and administrative decisions, there's no extra time to fiddle with your technology. There's always a bit of condescension when these posts come up, whether we're talking Linux or back in the day Mac OS, about continuing to use M$ products. It's like you're labeled for not wanting to f**k up your business by trying new software just for the sake of trying new software. If it were better, and CHEAPER, businesses would have switched years ago.