Microsoft Office Add-Ins
SharePoint Embedded
B2B eCommerce
Software Developers

For twenty-two years, McKenna Consultants have been developers of custom software for clients for:

  • Microsoft Outlook, Excel, Word Office Add-Ins
  • SharePoint Embedded (Microsoft 365 document editing for SaaS)
  • B2B eCommerce
  • Autonomous Agentic Artificial Intelligence
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Sectors We Serve

Deep domain experience where complex software matters most

Audit and Compliance

Secure, auditable document and data workflows for audit, risk and compliance teams.

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SaaS and Software Vendors

Microsoft 365 document editing, Office Add-Ins and integrations embedded inside your product.

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Manufacturing and Industrial Engineering

B2B eCommerce, systems integration and IoT for manufacturers and industrial engineering firms.

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Microsoft Office Add-In Development

We are specialist developers in complex front and back-end Microsoft Office Add-In development. We provide code samples for Office Add-Ins to assist developers in learning and building applications. We have implemented Outlook Office Add-Ins (and associated Graph API back-end systems) for CRM and work management systems, defining key settings and capabilities through the manifest. The manifest is crucial for configuring the add-in and establishing its functionality and user interface. We also implement Excel Office Add-Ins (for example, for the auditing and compliance industries). We also implement Word Office Add-Ins for legal SaaS and other clients, ensuring that each project is managed efficiently and effectively.

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B2B eCommerce

We build large-scale B2B eCommerce web stores, using a modular approach to integrate your existing business systems. We can integrate your ERP, CRM, CPQ, PIM, document store, warehousing and inventory, ordering, and other systems into a cohesive whole global web store, ensuring that your team can manage the transition smoothly. We are experienced in dealing with older and more complex systems as well as more modern platforms such as Elastic Path. Our focus is on creating fast, stable, and secure systems as a solid foundation for growth in eCommerce.

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SharePoint Embedded

SharePoint Embedded is Microsoft's modern, API-only successor to the Cloud Storage Partner Program for embedding Microsoft 365 document editing inside your SaaS application. SaaS vendors are our primary clients for this service. There is no Cloud Storage Partner Program membership to apply for, no WOPI host to build, your customer's documents stay inside their own Microsoft 365 tenant with native Microsoft Purview compliance, and your SaaS automatically becomes a first-class knowledge source for Microsoft 365 Copilot. We are delivering SharePoint Embedded implementations for new SaaS products today, and packaged migrations onto SharePoint Embedded for SaaS vendors with an existing WOPI host.

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Your Software Development Partners

For further information on our Office Add-In, SharePoint Embedded, B2B eCommerce or Agentic AI services, please fill in the short form on our Contact Us page and we'll get right back to you:

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Working with McKenna Consultants on our WOPI integration was a seamless and highly productive experience. Their team brought deep technical expertise and a clear understanding of both the Microsoft ecosystem and hybrid deployment challenges. McKenna's ability to collaborate closely with our in-house developers—particularly around integrating with our existing microservices architecture and aligning with our UX goals—was invaluable. Thanks to their support, we were able to deliver a WOPI implementation that works reliably across both our SaaS and on-premise environments, fully meeting the standards of Microsoft's Cloud Storage Partner Program (CSPP). I would gladly recommend McKenna Consultants to any organisation looking for a serious partner in enterprise-grade Office integration.

Andreas Pfanner Head of Software Development, Kendox

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