Using older versions of Outlook for Mac in business environments
Hi,
I'm sorry that the issue still persists. Regarding the issue with not being able to find other browsers in the App Store, it's possible that your Mac's operating system is not compatible with the latest version of those browsers. Please try downloading them directly from their respective websites, such as Google Chrome or Mozilla Firefox, and see if they work on your Mac. Just visit the website using Safari and follow the instructions to download and install the browser.
Check the below link; it may help you.
https://www.slipstick.com/outlook/add-addresses...
Best,
Mostafa
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Disclaimer - There is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before downloading and installing it.