How to force autodiscover v1 for outlook 2019 on autodiscover server side

  • Thread starter Thread starter Arreek
  • Start date Start date
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Arreek

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I'm looking at what Outlook 2019 does when adding new account. After entering email it queries autodiscover server here:

"GET /autodiscover/autodiscover.json?Email=test2%40plewa.it&Protocol=ActiveSync&RedirectCount=1 HTTP/1.1"

Now ActiveSync protocol is not supported here. Only Autodiscoverv1 is supported.

But outlook 2019 doesn't retry with Autodiscoverv1 query.

It also doesn't query autodiscover/autodiscover.xml service.



So, what autodiscover.json API response would cause Outlook 2019 to retry with Autodiscoverv1 protocol?


Tried forcing autodiscover.json to answer like:

HTTP 404:

{"ErrorCode":"InvalidProtocol","ErrorMessage":"The given protocol value ActiveSync is invalid. Supported values are AutodiscoverV1"}

but it doesn't do anything for outlook 2019.

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