Hello,

Jerome Gay <jeromg@gmail.com> writes:

> Since I upgraded orgmode to 9.x, refile is no longer working with ido.
> According to http://orgmode.org/Changes.html, all options related to ido
> and iswitchb have been removed. It also mentions "Instead Org uses regular
> functions, e.g., completion-read so as to let those libraries operate."
>
> However, being a recent vim-user-turned-emacs, I can't find how to setup
> ido (including ido-vertical) to work in orgmode 9.x the way it used to work
> in 8.x

I don't use ido, but I think you're looking for ido-ubiquitous:
https://github.com/DarwinAwardWinner/ido-ubiquitous

I've quickly tested with

    (require 'ido-ubiquitous)
    (ido-ubiquitous-mode 1)

and refiling seems to go through ido fine.

--
Kyle