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Outlook suddenly autoconfigures as an Activesync account

Alasdairb asked
Last Modified: 2020-05-07
Hello, my client has an Outlook.com email address which has been working fine for a few years. Yesterday Outlook started prompting for a password when he started outlook - it was a Microsoft popup box asking for the password associated with his xyz@outlook.com email address, and it won't accept it. Keeps popping up immediately after the password has been entered, again and again.

If he closes the box without entering a password he can get into outlook but of course can't get new mails.

It is Outlook 2016 Std MSI
I deleted the profile and recreated it using the standard auto-config wizard - full name, email address and password. He gets the prompt again and again, no way forward. So close the box and strangely enough the wizard finishes - 3 green ticks, all appears good (How? without specifying a password?).

Anyway, start outlook and it creates the folder list with his own additions but only one email.

"Reconnect Outlook2016/Outlook 2013 to Outlook.com to resume email access"

Checking the account type it shows Exchange Activesync. Not Exchange.

I didn't think this was possible, Microsoft abandoned Outlook / Activesync in 2017.

Does anyone have any ideas? I'm stumped.

Thanks in advance.
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