troubleshooting Question

Outlook suddenly autoconfigures as an Activesync account

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Alasdairb asked on
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Hello, my client has an 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 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 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.
Active Directory/Exchange Engineer
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