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class Program
{
    static string mailboxURI = "https://ex2010/ews/exchange.asmx"; // EWS
    static string username = "administrator";
    static string password = "pwd";
    static string domain = "ex2010.local";
 
    
    static void Main(string[] args)
    {
        try
        {
            ReadPublicFolders();
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }
 
    private static void ReadPublicFolders()
    {
        NetworkCredential credential = new NetworkCredential(username, password, domain);
        ExchangeWebServiceClient client = new ExchangeWebServiceClient(mailboxURI, credential);
 
        ExchangeFolderInfoCollection folders = client.ListPublicFolders();
        foreach (ExchangeFolderInfo publicFolder in folders)
        {
            Console.WriteLine("Name: " + publicFolder.DisplayName);
            Console.WriteLine("Subfolders count: " + publicFolder.ChildFolderCount);
            ListMessagesFromSubFolder(publicFolder, client);
            
        }
    }
 
    private static void ListMessagesFromSubFolder(ExchangeFolderInfo publicFolder, ExchangeWebServiceClient client)
    {
        Console.WriteLine("Folder Name: " + publicFolder.DisplayName);
        ExchangeMessageInfoCollection msgInfoCollection = client.ListMessagesFromPublicFolder(publicFolder);
        foreach (ExchangeMessageInfo messageInfo in msgInfoCollection)
        {
            MailMessage msg = client.FetchMessage(messageInfo.UniqueUri);
            Console.WriteLine(msg.Subject);
            msg.Save(msg.Subject + ".msg", MailMessageSaveType.OutlookMessageFormat);
        }
 
        // Call this method recursively for any subfolders
        if (publicFolder.ChildFolderCount > 0)
        {
            ExchangeFolderInfoCollection subfolders = client.ListSubFolders(publicFolder);
            foreach (ExchangeFolderInfo subfolder in subfolders)
            {
                ListMessagesFromSubFolder(subfolder, client);
            }
        }
    }
}