The Xen folks have been using OCaml for years. I interviewed with them back in 2006 (ish) because I had some Ocaml experience & a bunch of their top developers

The Xen folks have been using OCaml for years. I interviewed with them back in 2006 (ish) because I had some Ocaml experience & a bunch of their top developers had just quit to go form a database company (not that I knew that at the time).