I’ve been playing with Freelook recently, and it is quite a nice (Electron-based) solution for Outlook on Linux.

I found that I wanted to run multiple copies of Freelook for multiple email addresses, and one hack to achieve this is:

Edit /src/main.js:

const { app } = require('electron')
// HACK START
app.setPath ('userData', '/home/[USERNAME]/.config/freelook2');
// HACK END
const MailWindowController = require('./controller/mail-window-controller')
const TrayController = require('./controller/tray-controller')
const MenuController = require('./controller/menu-controller')
const Store = require('electron-store')
[...]

Running npm run start in this directory will now launch a new copy of Freelook with its own cookies and settings so that you can login to a different email account. It’s on the todo list to convert this hack into a configurable setting upstream, but for my current use case it works.