To all the folks answering basically "yes it's hard" I think the headline is a bit clickbaity but there are some interesting takeaways... To summarize, (a) yes it's harder than setting up Big Corp Mail, but (b) a lot of the horror stories are either old or secondhand, and (c) it's a lot less hard to set up than it used to be.

If the suggestion is, why not give it a try, one thing I feel is missed is, how hard is it not just to set up but to run over the long run, when the technology evolves and you have to keep up, and why would any IT manager or CIO want to gamble their careers on this?