Chrome is testing a new “Google recommended browser settings” pop-up in Windows that prompts users to set Chrome as the default browser.
To change the default browser in Outlook 365, go to File > Options > Advanced, then scroll to “Link Handling” and set “Open hyperlinks from Outlook in” to your preferred browser, like Chrome.
Not everybody wants to use Safari, the Mac's default web browser, but switching completely to another one looks difficult — until you know how. Using a browser that isn't set to your default on macOS ...