Microsoft gives final_FINAL.docx warning that Exchange Online users must drop basic authentication

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Microsoft Exchange Online users must ditch "basic authentication" or risk disconnection

Microsoft Exchange Online users have until Saturday, 1 October 2022, to move away from its "basic authentication" login method or risk having their services interrupted, according to a statement from the company.

Microsoft said that starting 1 October, it would begin randomly selecting tenants to disable their basic authentication access for various Exchange email services.
 
They have actually been doing it for a while now.

Lots of business printers have been set up with a free Outlook.com account for scan-to-email, which cannot use OAuth2.

Heard from our supplier that they are kept somewhat busy changing it over to 'app passwords' for every printer.
 
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