Office Add-in Express is a tool for creating MS Office COM add-ins in Delphi. You develop a single component that will run across the entire Office suite of applications - Excel, Word, PowerPoint, Outlook, Access, and Project. Add-in Express hides complexity of implementing the IDTExtensibility2 interface that COM add-in architecture is based on. You create your own toolbars and place buttons, edit boxes, combo boxes, and pop-ups onto them.