[Halfmanhalfamazing]

I guess it depends on the grandma. Mine happily uses linux for email, internet, and solitaire. *shrug*

[Terpfen]

I have the belief that there’s no such thing as a one-size-fits-all OS.

Very true. Linux is a great server OS, not so good for end users. Conversely, OS X is great for end users, probably not so much for servers.