Exchange Web Service FolderId for a not well known folder name

Question

I have a folder in an Exchange mailbox that is a child of the root (not Inbox).

How do I get the ID of such folder using EWS Managed API?

Only examples I find are those relating to WellKnownFolderNames.

Answer 1

You can find all Folders with the FindFolders method. Use WellKnownFolderName.Root to show all your folders of your Inbox. You have to create a FolderView and add the properties you want to see (ID and DisplayName for example). Set the traversal to Deep to find all of your folders. In my example, I'm looking for the folder with the DisplayName "Test".

// set Server
ExchangeService server = new ExchangeService(ExchangeVersion.Exchange2007_SP1);
server.UseDefaultCredentials = true;
string configUrl = @"https://yourServerAddress.asmx";
server.Url = new Uri(configUrl);

// set View
FolderView view = new FolderView(100);
view.PropertySet = new PropertySet(BasePropertySet.IdOnly);
view.PropertySet.Add(FolderSchema.DisplayName);
view.Traversal = FolderTraversal.Deep;

FindFoldersResults findFolderResults = server.FindFolders(WellKnownFolderName.Root, view);

// find specific folder
foreach (Folder f in findFolderResults)
{
    // show FolderId of the folder "Test"
    if (f.DisplayName == "Test")
    {
        Console.WriteLine(f.Id);
    }
}