We developed an Office Mail App for Exchange 2013 which needs to read some custom properties of the currently selected mail item.

We use makeEwsRequestAsync with a GetItem request and that works without problems when the item sits in the current users mailbox.

When the user added a public folder to his Favorites, selects a message in that folder and activates our Mail App the GetItem request returns an error which contains this:

<m:ResponseCode>ErrorAccessDenied</m:ResponseCode>

The error message is always in german, setting the mailbox language in OWA to en-us didn't change that. This is the error message:

Mit der Nebenstellennummer sollte nur auf das Act-As-Benutzerpostfach zugegriffen werden.

Something like: With the extension number you should only access the act-as-user mailbox

Any ideas how to access public folder items?

The Public Folder btw is located on Exchange 2013, the same server as the user mailbox.

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Anything new on this? We're having the same issue when trying to connect to shared mailbox with makeEwsRequestAsync.

<m:MessageText>Office extension have no permissions to access any other mailboxes then the mailbox provided in the user context.</m:MessageText>

<m:ResponseCode>ErrorAccessDenied</m:ResponseCode>

No simple way yet. See here:

https://social.msdn.microsoft.com/Forums/sqlserver/en-US/30b3cf12-77ca-4d3c-989e-5ef793c90ccd/e2013mailapp-mailboxmakeewsrequestasync-getitem-cannot-access-public-folder-item?forum=appsforoffice

and here:

https://twitter.com/JasonJohMSFT/status/601402985831337984