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Plugins & Integrations

Top 10 Microsoft Office Add-in Development Agencies for Enterprise

ET
Engineering Team
Enterprise Integration Experts
June 10, 2026
6 min read
Top 10 Microsoft Office Add-in Development Agencies for Enterprise — Plugins & Integrations | MetaDesign Solutions

Introduction

Need custom Office 365 Add-in development? Here are the top 10 agencies to consider.

1. MetaDesign Solutions

Experts in VSTO to Web Add-in migrations and complex Microsoft Graph integrations.

2. Add-in Express

Famous for their Office development frameworks and consulting.

3. Aerie Consulting

Specialists in SharePoint and Office 365 workflows.

4. SumatoSoft

Custom SaaS and Office integration developers.

5. ScienceSoft

Massive IT consulting firm with a strong Microsoft practice.

6. Itransition

Global software development company with deep Microsoft expertise.

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7. N-iX

European IT services company offering custom Office solutions.

8. Iflexion

Provides robust enterprise productivity add-ins.

9. Intellectsoft

Boutique agency building secure integrations for finance and healthcare.

10. Cyber Infrastructure (CIS)

Large-scale outsourcing for Office and Outlook plugins.

Conclusion

Partner with the best to ensure secure integrations.

FAQ

Frequently Asked Questions

Common questions about this topic, answered by our engineering team.

Web Add-ins are the modern standard as they work across Windows, Mac, and the web.

Yes, they can connect to Salesforce, Dynamics, and custom CRMs via APIs.

Some Outlook Web Add-ins are supported on iOS and Android.

They run in a secure sandbox and must adhere to strict enterprise compliance policies.

Modern Add-ins use HTML, CSS, JavaScript/TypeScript, and React.

Ready when you are

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A 30-minute call with a principal engineer. We'll listen, sketch, and tell you whether we're the right partner — even if the answer is no.

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