Delphi 5-2010 offers a rapid application development tool for creating COM Add-ins, Smart Tags, and Real-Time Data(RTD) servers. One can write the code once and the extension will work in all Office versions from 2000 to 2010 (32-bit). It supports tools like Outlook, Excel, Word, PowerPoint, and FrontPage.

Add-in Express allows your add-ins to have version-neutrality; you can write add-in code once and have it run without issues across all versions of Microsoft Office 2000 through 2010. With its visual designers, you can customize your own toolbars, menus, sub-menus, and pop-ups for all Office versions ranging from 2000 to 2007. Additionally, you can customize all tabs for Microsoft Office 2010 and 2007 Ribbon UI, tune the Quick Access Toolbar, and build the Backstage View for Office 2010. All these features make building custom task panes for Microsoft Office 2007 and 2010 applications an effortless task.
Add-in Express helps create application-level keyboard shortcuts for your extensions, giving your end-users the ultimate experience. Besides, you can program Smart Tag recognizers and their actions or develop Microsoft Excel RTD servers and topics, among other things. The software allows you to develop custom task panes, Outlook options, and property pages.
Add-in Express takes into account all the end-user applications, including Outlook, Excel, Word, PowerPoint, Visio, Project, MapPoint, Publisher, Access, FrontPage, and InfoPath, among others. The software is developed in Delphi and directly supports Delphi 5 - 2010, including the Architect, Enterprise and Professional Delphi editions.
In conclusion, Add-in Express for Office and VCL is a complete and effective software that helps create powerful and easy deployable plug-ins for all available Microsoft Office versions. It allows customizing all elements of the Office user interface, enables version-neutrality, and helps you create add-ins without extensive coding. For more information, please refer to their official website.
Version 2010.6:
ADDED: Support for Microsoft Office 2010 32-bit;
Support for Load on demand add-ins;
In-place designers;