// create IMAP client instance, connect, log in
using (var imap = new Rebex.Net.Imap())
{
    imap.Connect(hostname, SslMode.Implicit);
    imap.Login(username, password);

    // upload a message to "Inbox" folder
    // Unique ID assigned to the message is returned by the method if supported by the server
    string uniqueId = imap.StoreMessage("Inbox", mail);

    // check whether UIDPLUS is supported and enabled
    if ((imap.SupportedExtensions & imap.EnabledExtensions & ImapExtensions.UniqueIdPlus) ==
        ImapExtensions.UniqueIdPlus)
    {
        Console.WriteLine("Message ID: {0}", uniqueId);
    }
}

// create IMAP client instance, connect, log in
// ...

// determine Inbox quotas
imap.SendCommand("GETQUOTAROOT", "Inbox");
ImapResponse response = imap.ReadResponse();

// check the response code
if (response.Code != ImapResponseCode.Ok)
{
    Console.WriteLine("Command not understood.");
}
else
{
    // display Inbox quotas returned by the server
    foreach (ImapResponseLine line in response.GetLines())
    {
        if (line.Code == "QUOTA")
        {
            // Format: quote_root_name (resource_name current_usage limit)
            // Sample: "" (STORAGE 546615 7599416)
            Console.WriteLine(line.Parameters);
        }
    }
}

// create IMAP client instance and connect
// ...

// does the server support IDLE command?
bool idleSupported = (imap.SupportedExtensions & ImapExtensions.Idle) == ImapExtensions.Idle;

// disable UIDPLUS extension
imap.EnabledExtensions &= ~ImapExtensions.UniqueIdPlus;

// create IMAP client instance, connect
// ...

// authenticate to a shared mailbox
imap.Login("Domain/Username/AliasOfSharedMailbox", password);

// or use it like this (equivalent to above)
imap.Login("Username@Domain/AliasOfSharedMailbox", password);