We develop & distribute CloudReady because we believe in a secure, light operating system accessible across hardware options. It's clear people have preferences on the productivity tools that work best for them and we want to streamline the experience of using whatever preferred online tool is best for you.
Here are some steps to setup a more Office 365-friendly experience on your CloudReady machine:
1) Install this extension from Microsoft
2) Go to chrome://flags (as if it is a website) and find the entry titled "Office Editing for Docs, Sheets & Slides" - set it to disabled, then save and restart.
3) Install this extension for your file system - this will show OneDrive (the default storage for Office Online) in your Files App similar to how Google Drive shows up
With all that in place, you can log in as your Microsoft user and use Office Online, and whenever you click on a MSOffice file-type it will ignore GDocs and try to open in Office online.
We want to offer the manual steps of creating a more Office 365 friendly setup to your CloudReady experience to the community if there is interest in them. So we'd like to hear from you if you're using Office Online with CloudReady!