VSTO Add-in Development Company
Our VSTO Add-in Development Services
SCAND delivers end-to-end VSTO add-in development services designed for businesses that rely on Microsoft Office as a core operational platform. We create custom, secure, and high-performance VSTO add-ins that extend Office functionality, automate workflows, and integrate seamlessly with enterprise software.
We build VSTO-based solutions for Microsoft Outlook that automate email processing, scheduling, and data synchronization. Our developers customize ribbons, Outlook Form Regions, and Custom Task Panes (CTP) to streamline communication workflows and integrate Outlook directly with CRM and ERP systems such as Salesforce and SAP, as well as internal business systems — improving user productivity and operational control.
Excel add-ins built using VSTO can perform advanced data analysis and automate complex calculations in situations where Office Web Add-ins fail due to performance and sandbox limitations. We customize Excel functionality for working with large datasets, enabling real-time analysis, automated reporting, and secure database connectivity while maintaining high performance, reliability, and accuracy.
Word & PowerPoint Document Automation
SCAND develops VSTO Office add-ins (for PowerPoint or Word) to automate dynamic report generation, formatting, and template management. Through these solutions, businesses standardize their reports, presentations, and templates, ensure brand consistency, and create automated documents directly in Microsoft Office with minimal effort.
Legacy COM & VBA Modernization
We assist companies in modernizing unstable and insecure VBA macros and legacy C++ COM add-ins by migrating them to robust C#/.NET-based solutions, including VSTO add-ins. This approach significantly improves security, performance, and maintainability while ensuring long-term compatibility with the latest versions of Microsoft Office.
Our VSTO add-ins connect Microsoft Office applications with external APIs, cloud databases, and enterprise software platforms. We integrate Office with AWS, Microsoft SQL Server, DB2 enterprise databases, internal APIs, and third-party applications. This enables reliable data transfer and workflow automation, allowing business operations to be handled directly from familiar Office tools.
VSTO Maintenance, Support & Deployment
In addition to development, we provide a full range of post-development services for VSTO add-ins, including ongoing support, regular updates, and deployment. We manage the complete add-in lifecycle using ClickOnce or MSI installers, ensure compatibility with the latest Microsoft Office updates, handle centralized deployment, and provide long-term maintenance to keep the solution stable and deliver ongoing business value.
Our VSTO Development Tech Stack
SCAND uses a proven VSTO development technology stack to build secure, scalable, and high-performance add-ins for the Microsoft Office suite. Our tools and frameworks ensure deep integration, long-term compatibility, and reliable operation across multiple versions of Office.
Programming Languages
- C#
- VB.NET
NET & Runtime
- .NET Framework 4.8
- .NET Core
Office Integration
- Primary Interop Assemblies (PIA)
- COM Interop
- Microsoft Office Object Model
- Messaging Application Programming Interface (MAPI)
UI & Customization
- Ribbon XML
- context menus
- Outlook Form Regions
- Task panes
- Office dialogs
Data & Connectivity
- Microsoft SQL Server
- REST APIs
- Cloud services
- Secure data exchange
Deployment & Distribution
- ClickOnce
- MSI installers
- Centralized deployment
Development Tools
- Visual Studio
- Debugging, and profiling tools
Our Proven VSTO Development Process
SCAND follows a structured and transparent VSTO development approach that ensures reliable implementation, seamless integration with Microsoft Office, and measurable business results at every stage of the project.
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2. UI/UX Design
Our team designs the add-in structure, including ribbons, task panes, and user interaction logic. We focus on usability, performance, and seamless operation directly within Excel, Outlook, Word, or PowerPoint.
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3. Development
Using C# and proven .NET framework, our developers implement core functionality, automation logic, and system integrations. We build clean, maintainable code that ensures stable performance across Office versions.
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4. QA & Testing
Each VSTO add-in is tested across multiple versions of Microsoft Office and Windows to ensure reliability, security, and a consistent user experience. We validate performance, data integrity, and integration scenarios under real business conditions.
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5. Deployment
We configure centralized deployment, prepare installers, and provide technical documentation. After release, we support ongoing maintenance, updates, and enhancements to keep the solution aligned with evolving business operations.
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1. Discovery
We start by analyzing business needs, existing Office tools, and user workflows. This step allows us to define the scope, select the right VSTO architecture, and plan integration with Microsoft Office, enterprise systems, and APIs.
Trusted Software Development Company
For over 25 years, SCAND has been delivering secure, high-load software solutions for startups, SMBs, and global enterprises (including NASA, IBM, Cisco, FedEx, Bank of America, Siemens, and others). Our dedicated development teams support clients at every stage of the software development process — from idea and consulting to maintenance and support.
VSTO Success Stories: Real-World Case Studies
- React
- Node.js
- Desktop
Industry-Specific VSTO Solutions
We develop custom VSTO add-ins tailored to the operational requirements of specific industries.
We build VSTO-based solutions for Excel and Outlook that support financial analysis, reporting automation, and secure data processing. These add-ins integrate with internal databases and enterprise systems, enabling professionals to work with complex datasets directly within familiar Office tools.
Our VSTO solutions for Office Word automate document creation, formatting, and content management. Legal teams use these tools to streamline contract workflows, manage document metadata, and reduce manual effort while maintaining consistency and compliance.
For logistics-driven organizations, we develop VSTO add-ins that connect Excel and Outlook with external systems and databases. These solutions help automate scheduling, data synchronization, and operational reporting, improving coordination and visibility across supply chain processes.
We create secure VSTO-based applications that support structured data entry, reporting, and document workflows in regulated environments. Our solutions help healthcare and life sciences organizations process sensitive information within Microsoft Office while meeting security and compliance requirements.
VSTO vs. Office JavaScript API: Choosing the Right Tech
Choosing between VSTO and Office JavaScript API depends on your business goals, required level of integration, and target Office environment. Our experts help you evaluate both technologies and select the most effective approach for your Microsoft Office solution — ensuring performance, security, and long-term maintainability.
Hire Expert VSTO Developers: Why Partner with SCAND?
Partnering with SCAND means working with a VSTO development company that understands Microsoft Office at the platform level. We help businesses build secure, scalable, and high-quality VSTO add-ins that integrate seamlessly into existing workflows and deliver long-term business value.
Enterprise-Grade VSTO Expertise
Our developers specialize in VSTO-based solutions for Excel, Outlook, Word, and PowerPoint, delivering deep integration with the Microsoft Office Object Model, COM add-ins, and enterprise systems. We handle complex logic, performance-critical operations, and advanced customization that typical Office add-ins cannot support.
Veteran .NET Talent with Office Focus
When you hire VSTO developers from SCAND, you work with senior .NET engineers who understand Office internals, Interop technologies, and desktop application architecture. This expertise ensures stable operation, clean implementation, and reliable user experience across Office versions.
25+ Years of Engineering Experience with Complex Systems
With over 25 years of engineering experience, we successfully deliver VSTO add-ins for complex, high-load, and business-critical enterprise systems — including scenarios that other vendors consider “unfixable.” Our solutions support automation, workflow optimization, CRM integration, and large-scale data processing directly within familiar Office tools.
Data Sovereignty, Security, and Risk-Free Engagement
VSTO add-ins developed by SCAND process data locally within the Microsoft Office environment, ensuring full data sovereignty and maximum security without relying on external cloud services. Additionally, we offer a 1-month zero billing guarantee, which means clients are billed only after the first month based on delivered results and confirmed scope.
Frequently Asked Questions (FAQ)
