Add-in Express for Microsoft Office and .net

Add-in ExpressOffice Productivity Suites.NET
Version 10.4.4741 (Mar 11, 2026)(3)

Develop versatile Microsoft Office extensions with a unified .NET framework.

  • Supports all major Microsoft Office applications and versions.
  • Enables creation of COM add-ins, smart tags, Excel RTD servers, XLL add-ins, and UDFs.
  • Includes visual designers, components, wizards for efficient add-in development.
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Easily write professional extensions for Microsoft Office such as COM add-ins, smart tags, real-time data servers and user-defined functions.
Add-in Express for Microsoft Office and .net delivers a robust framework for building secure and version-neutral Office extensions with minimal coding. It integrates visual designers, components, and tools to help developers create COM add-ins, Excel RTD servers, smart tags, XLL add-ins, and automation add-ins from a single shared code base, supporting a wide range of Office versions and applications.

Comprehensive .NET Components and Visual Designers

The framework includes a rich set of components, visual designers, and wizards that simplify the development of Office add-ins and extensions across multiple Office applications and versions.

Wide Office Application and Version Support

Supports Microsoft Office applications including Outlook, Word, Excel, PowerPoint, Access, and others.

Unified Single Code Base Development

Enables developers to write shared code that works across all supported Office versions and applications.

Support for Various Extension Types

Facilitates creation of application-level COM add-ins, Outlook plug-ins, smart tags compatible with Word, Excel, PowerPoint, and Outlook, Excel real-time data (RTD) servers, and Excel user-defined functions (UDFs).

Advanced Excel Integration

Provides tools for building Excel Automation add-ins, XLL add-ins that support multi-threaded functions, and advanced Excel GUI components..

UI Customization and Ribbon Support

Includes designers to customize existing Office ribbons, command bars, toolbars, and menus as well as to add custom UI elements such as advanced task panes and Outlook form regions.

Version-Neutral Interop Assemblies

Uses version-neutral interop assemblies to facilitate interaction with Office objects and events without binding to specific Office PIA versions.

Deployment and Installation Options

Supports multiple deployment methods including MSI installers, ClickOnce, and ClickTwice, with automatic generation of setup scripts and support for Windows Installer and group policy deployments.

Extended Outlook Customization

Provides unique features such as advanced Outlook form and view regions which allow UI customization in Outlook, supporting folder views, reading panes, and message inspectors.

Product Compatibility

Review the details below to ensure this product is supported within your environment.

Component Type

  • .NET

.NET Version

  • .NET 4.8 or earlier

.NET Platform

  • .NET Class

IDE Support

  • Visual Studio