OneNote 2013: 'Microsoft.Office.Interop.OneNote.Application' does not contain a definition for 'Windows'

Hi guys,

when trying to understand the samples from the MSDN OneNote 2013 Developer Reference (http://msdn.microsoft.com/en-us/library/office/jj680118%28v=office.15%29.aspx) I did the following:

• Visual Studio 2013 Update 4, creating new proejct (Winforms)
• Set reference to Microsoft.Office.Interop.OneNote namespace (v15)
• Wrote the following code:

namespace ont2013OM
{
    public partial class Form1 : Form
    {
        ont.Application appOneNote = new ont.Application();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            uint anz = appOneNote.Windows.Count;
        }
    }
}

Everythingis fine so far, getting intellisense for OneNote OM and all, but when hitting "Build" or "Debug" I get an 'Microsoft.Office.Interop.OneNote.Application' does not contain a definition for 'Windows' error for my codeline in Form1_Load.

What's that!?

Environment: Win 8.1 64bit, Office 2013 32bit, Visual Studio 2013 Update 4.