> And Windows can operate as a server running all sorts of things like Active Directory, Exchange, etc. - that's because Microsoft bundles the software with it

> And Windows can operate as a server running all sorts of things like Active Directory, Exchange, etc. - that's because Microsoft bundles the software with it to allow it to do this, but the underlying operating system remains the same. Actually, it seriously isn't - Windows Server has a hugely changed set of features compared to Windows on the desktop, from the kernel upwards. The software in question is tied heavily into every piece of the OS - there is almost no major component in Windows 10 that is exactly the same in its equivalent server build. This is very different from both OS X and Linux. OS X is very much not designed to act as a permanently always-on server in a business-critical capacity - what I'd expect from a server OS. The fact that Apple sell a product called "server" doesn't change that, any more than that XAMPP exists for Windows 10. To put it in a question - would you run your SaaS off of OS X?