Extend Outlook forms & views
Advanced Outlook regions for VSTO: C#, VB.NET

Add-in Express™ Regions
for Microsoft® Outlook® and VSTO

Supported IDEs

  • Visual Studio 2012
  • Visual Studio 2013
  • Visual Studio 2015
  • Visual Studio 2017
  • Visual Studio 2019
  • Visual Studio 2022
  • Requires VSTO installed

  • Visual Basic .NET
  • Visual C# .NET

Supported apps

  • Outlook 2003
  • Outlook 2007
  • Outlook 2010 (x86 and x64)
  • Outlook 2013 (x86 and x64)
  • Outlook 2016 (x86 and x64)
  • Outlook 2019 (x86 and x64)
  • Outlook 2021 (x86 and x64)

Add-in Express Regions for Microsoft Outlook and VSTO is an extension of Visual Studio Tools for Office (VSTO) that allows you to customize Outlook views and Outlook forms with any .NET controls.

Screenshots gallery

Regions for your existing VSTO Outlook projects

This solution effectively allows you to continue designing your Outlook solutions using Visual Studio Tools for Office. In other words, even if you have an Outlook Add-in project developed with VSTO, you can install Add-in Express Regions and immediately start taking advantage of powerful Advanced Outlook View and Form Regions technology.

Outlook view and form regions - key features

Advanced Regions provide developers several unique advantages over the traditional Outlook Form Regions available in VSTO projects:

  • You can add regions to practically all Outlook windows
  • You can create form regions for Inspector windows and view regions for Outlook Explorer windows
  • Your regions work for all versions of Outlook from 2003 to 2021
  • Your regions are shared (multiple regions can share the same area with the ability to switch between them)
  • Your regions can be hidden and minimized
  • Your regions can be dragged between Outlook panes

Add-in Express helps Outlook developers write their code faster and better - one of our core philosophies. As such, Add-in Express Regions prominently features wizards for quickly creating your regions, associating them with Outlook windows and binding the regions to certain Outlook context.

"Add-in Express Regions" vs "Add-in Express for Office and .net"

Add-in Express Regions is a VSTO-specific implementation of the most popular technology included in Add-in Express for Office and .net, namely the Advanced Outlook Regions. Add-in Express for Office and .net allows creating version-neutral extensions for all Office applications (COM add-ins, smart tags, Excel RTD servers and XLLs), while Add-in Express Regions allows adding advanced Outlook regions to any VSTO project, either a new or existing one.