Dim commandBar As Office.CommandBar
Dim WithEvents button As Office.CommandBarButton

Const TOOLBARNAME As String = "ExampleBar"
Const REGROOT As String = "Software\YourCompany\YourApp"

Dim WithEvents explorerEvents As Outlook.ExplorerEvents_Event
Dim explorer As Outlook.Explorer

Private Sub ThisAddIn_Startup(ByVal sender As Object, _
    ByVal e As System.EventArgs) Handles Me.Startup
    explorer = Me.Application.ActiveExplorer()

    If (explorer IsNot Nothing) Then

        commandBar = Me.Application.ActiveExplorer.CommandBars.Add( _
            TOOLBARNAME, _
            Office.MsoBarPosition.msoBarFloating, _
            False, _
            True)

        button = TryCast(commandBar.Controls.Add( _
            Office.MsoControlType.msoControlButton, _
            System.Type.Missing, System.Type.Missing, _
                1, True), Office.CommandBarButton)

        button.Style = _
            Microsoft.Office.Core.MsoButtonStyle.msoButtonCaption
        button.Caption = "Button 1"
        button.Tag = "newButton"

        LoadCommandBarSettings()

    End If
End Sub

Private Sub SaveCommandBarSettings()
    MySettings.Default("CommandBarTop") = commandBar.Top
    MySettings.Default("CommandBarLeft") = commandBar.Left
    MySettings.Default("CommandBarVisible") = commandBar.Visible
    MySettings.Default("CommandBarPosition") = CInt(commandBar.Position)
    MySettings.Default("CommandBarRowIndex") = commandBar.RowIndex
    MySettings.Default.Save()
End Sub

Private Sub LoadCommandBarSettings()
    Dim position As Microsoft.Office.Core.MsoBarPosition = _
        CType(MySettings.Default("CommandBarPosition"),  _
            Microsoft.Office.Core.MsoBarPosition)

    Dim rowIndex As Integer = _
        CInt(MySettings.Default("CommandBarRowIndex"))

    commandBar.RowIndex = rowIndex

    Dim top As Integer = _
        CInt(MySettings.Default("CommandBarTop"))

    commandBar.Top = _
        CInt(IIf(top <> 0, top, _
        System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height / 2))

    Dim left As Integer = _
        CInt(MySettings.Default("CommandBarLeft"))

    commandBar.Left = _
        CInt(IIf(left <> 0, left, _
        System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width / 2))

    Dim visible As Boolean = _
        CBool(MySettings.Default("CommandBarVisible"))

    commandBar.Visible = visible

End Sub

Private Sub Click(ByVal ctrl As  _
    Microsoft.Office.Core.CommandBarButton, _
    ByRef cancelDefault As Boolean) Handles Button.Click
    System.Windows.Forms.MessageBox.Show("Hello World!")
End Sub

Sub ThisAddIn_Close() Handles explorerEvents.Close

    SaveCommandBarSettings()
End Sub