Outlook Custom API-Integrated VSTO Add-in

Client Description

The client required a sophisticated VSTO add-in for Microsoft Outlook developed in C#. The add-in is designed to enhance email functionality by integrating a custom form that triggers upon sending an email, allowing for immediate updates to contact information and seamless interaction with an external API.

Project Highlights


The goal is to streamline the process of updating contact information and interacting with external systems via API immediately after an email is sent, enhancing data accuracy and operational efficiency.

Key Features

  • Custom Form Trigger: A custom form pops up when the email send button is pressed, prompting the user for additional inputs and updates.
  • API Integration: After updating contact details, the add-in sends the modified data, along with email contents and attachments, to a specified API using multipart/form-data.
  • Seamless Email Integration: Ensures that the email sending process remains intact and functional after the API call, maintaining the usual workflow with enhanced functionality.

Technologies Used

  • VSTO (Visual Studio Tools for Office): Utilized for creating the Outlook add-in within the Microsoft Office ecosystem.
  • C#: Programming language used for developing the add-in.
  • REST API: Enables interaction with external systems to update and synchronize data efficiently.

Client's Feedback

"Great work!!"

My Feedback

"Jean gave me clear requirements and was always available to answer my questions regarding the Outlook addin we worked on. And to agree upon customization was easy. Overall working with Jean was an easy and I was motivated to finish this project the best I could!"

Related to Product

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