Add in Express for Office and .NET

Key Features

• All-in-one platform for developing any types of Office extensibility projects, including COM add-ins, smart tags, RTD servers and user-defined functions for Microsoft Office 2010 - 2000.
• Create application-specific plugins and shared extensions that work on all end-user applications: Outlook, Excel, Word, PowerPoint, Visio, Project, MapPoint, Publisher, etc.
• in C#, VB.NET, C++ and Delphi Prism.
• More info: http://www.add-in-express.com

Technical Specifications

• **Publisher:** https://www.add-in-express.com/add-in-net/
• **License:** Shareware
• **Operating System:** Windows 7, Windows 8, Windows 10, Windows 11
• **Last Updated:** October 15, 2025
• **Category:** Programming / Developer Tools