Using older versions of Outlook for Mac in business environments
I have had similar issues and had constant junk mail. The hackers used a fake outlook page and try to steal your log in details. I actually had to wipe my hard drive to clear the issues and then i ran the anti virus scans including boot and changed my outlook password. Still getting some junk but at least have the option to block and report phishing. I also use an Avast VPN on laptop and mobile.
After clearing the hard drive ( and saving to a USB ) and after I ran the Avast Quick scan and deep scan and boot scan ..I had an alert that Avast had blocked a phishing program that was trying to get installed on my laptop. I then sent this file to Avast on their system to investigate it.
I also had a few phone calls on my mobile phone purporting to be website development companies and health companies etc etc and they’re all from Vietnam.
I had a whistle ready and as soon as I heard the hackers Vietnamese voice saying he was a website building company and that I’d won a free £200 gift and wanted my bank card so he could credit my card …I then blew my whistle into the phone ! Haven’t had any other calls since then.
I now type in the browser the website I want and don’t search on Google