How to retrive 'X-PublicFolderMailbox' using soap ews - outlook

Question

To route the requests to a public folder mailbox, you need to set the X-AnchorMailbox and X-PublicFolderMailbox headers to specific values returned by the Autodiscover service.
I have retrieved 'X-AnchorMailbox' value using the below soap call.
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope
xmlns:a="http://schemas.microsoft.com/exchange/2010/Autodiscover"
xmlns:wsa="http://www.w3.org/2005/08/addressing"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Header>
<a:RequestedServerVersion>Exchange2010</a:RequestedServerVersion>
<wsa:Action>http://schemas.microsoft.com/exchange/2010/Autodiscover/Autodiscover/GetUserSettings</wsa:Action>
<wsa:To>https://outlook.com/autodiscover/autodiscover.svc</wsa:To>
</soap:Header>
<soap:Body>
<a:GetUserSettingsRequestMessage
xmlns:a="http://schemas.microsoft.com/exchange/2010/Autodiscover">
<a:Request>
<a:Users>
<a:User>
<a:Mailbox>%s</a:Mailbox>
</a:User>
</a:Users>
<a:RequestedSettings>
<a:Setting>PublicFolderInformation</a:Setting>
</a:RequestedSettings>
</a:Request>
</a:GetUserSettingsRequestMessage>
</soap:Body>
</soap:Envelope>
But I am not able to fetch X-PublicFolderMailbox using soap call.
Please help with xml schema and endpoint for request.

Answer 1

You don't use SOAP to get the X-PublicFolderMailbox value you need to make a POX (Plain old XML) auto-discover request against the Mailbox from the PublicFolderInformation eg
<?xml version="1.0" encoding="utf-8"?>
<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/requestschema/2006">
<Request>
<EMailAddress>SharedPublicFolder#contoso.com</EMailAddress>
<AcceptableResponseSchema>http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a</AcceptableResponseSchema>
</Request>
</Autodiscover>
and use the Server value from the response as per https://learn.microsoft.com/en-us/exchange/client-developer/exchange-web-services/how-to-route-public-folder-hierarchy-requests?redirectedfrom=MSDN