I'm using the Outlook Focused Inbox feature and currently I don't have an email workflow in which I archive emails I no longer need. I would like to switch to that, but I need to start from a blank state, meaning I should archive all of my emails.
If I click on the checkbox to select all my emails, though, the Archive option is greyed out, and there is an option to delete the emails, but it is not what I want to do.
In my specific situation, "Other" contains a bunch of newsletters I don't care about.
Edit: the button is greyed out even if focused inbox is disabled