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I want to create VSTO addin to an Outlook Application
and I try to enumerate subfolders in shared exchange mailbox (this is not my primary mailbox, i have only full access rights to that mailbox).

Unfortunately, my code give me empty collection

using System;
using Outlook = Microsoft.Office.Interop.Outlook;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace ManageSharedMailbox {
    public partial class MSMAddIn {
        private void ThisAddIn_Startup(object sender, System.EventArgs e){

        private void ThisAddIn_Shutdown(object sender, System.EventArgs e){}

        private void InternalStartup(){
            this.Startup += new System.EventHandler(ThisAddIn_Startup);
            this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);

        private void PrepareRibbons() {
            const string PomijanePrefixy = "!@#$%^&*()_+=[]{};':\",./<>?|\\`~ ";
            const string PomijaneNazwy = "|archiwum|itemprocsearch|folder nadrzędny folderów osobistych|folder główny wyszukiwania|ipm_common_views|foldery wyszukiwania|freebusy data|";

            foreach (Outlook.Folder folder in Application.Session.Folders) {

                if (null == folder.Store) continue;

                if (!folder.Store.IsOpen) continue;

                Outlook.OlExchangeStoreType storetype = folder.Store.ExchangeStoreType;
                if (storetype == Outlook.OlExchangeStoreType.olExchangePublicFolder) continue;

                if (storetype != Outlook.OlExchangeStoreType.olExchangeMailbox) continue;

                //  I skip connected mailboxes without "SHARED" text in name 
                if (!folder.Name.ToLower().Contains("shared")) continue;

                Outlook.MAPIFolder ofInbox = folder.Store.GetDefaultFolder(Microsoft.Office.Interop.Outlook.OlDefaultFolders.olFolderInbox);
                if (null == ofInbox) continue;

                foreach (Outlook.Folder folderQuery in folder.Folders) {                    
                    if (folderQuery.DefaultItemType != Outlook.OlItemType.olMailItem) continue;

                    //  I parse only INBOX folder 
                    if (folderQuery.EntryID != ofInbox.EntryID) continue;
                    foreach (var item in folderQuery.Items) {
                        //  Works, I can iterate through emails (not folders!) in this folder 

                    foreach (Outlook.Folder folderEntries in folderQuery.Folders) {
                        //  This collection is always empty, 
                        // regardless of how many subfolders 
                        // I have in the Inbox folder selected shared mailbox
                        // How to fill that collection ? 
                        // or get list of these folders ?
                if (null != ofInbox) Marshal.ReleaseComObject(ofInbox);

This code works ok, if I parse my primary exchange OR connected .pst files.

What I have tried:

I try to get via Outlook.Explored object, but without success.

I also changed "CacheOthersMail" value to 1 at HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\14.0\outlook\Cached Mode\ key
Updated 29-Mar-16 3:53am

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