Add Owl for Exchange on included accounts

Hello! I'm install [Owl for Exchange](https://addons.thunderbird.net/en-US/thunderbird/addon/owl-for-exchange/) on my Thunderbird and Firetray does not see my Exchange account :(

![Снимок экрана от 2019-10-19 21-44-04](https://user-images.githubusercontent.com/40290212/67148536-e5377800-f2b9-11e9-8780-1c744bd9ca0b.png)
