Hi,
Look at this Outlook 2007 add-in article
Outlook 2007 CPU Monitor AddIn[
^]
To create a button you will see in the article that you can do it this way:
// Create the button in the standard toolbar.
newButton = (Microsoft.Office.Core.CommandBarButton)
this.Application.ActiveExplorer().CommandBars["standard"].Controls.Add(
Microsoft.Office.Core.MsoControlType.msoControlButton,
missing, missing, missing, missing);
Good luck.
Valery.