Google tightens the screw on 'less secure apps', will block most access from June 2020

Anything less than the latest version of Outlook to be blocked soon

The clock is ticking for businesses using what Google defines as a "less secure app" (LSA) to access services like its G Suite mail, calendar and contacts. New accounts will be blocked from using LSAs from June 15 2020, and all access will be disabled on February 15 2021."