Outlook Add-ins Development

MSOfficeAddin is a specialist outlook add-in development company serving enterprise clients across the US, UK, Australia, and EMEA. We build custom Office.js solutions that work consistently across Outlook on Windows, Mac, the web (OWA), and Outlook mobile, giving every user a consistent inbox experience on every device. A frequent requirement is syncing emails, contacts, and meetings straight into a sales pipeline, which we deliver through CRM integration for Outlook.

Every engagement begins with a discovery session to map your email and calendar workflows and identify which Office.js APIs apply. We then design the task pane or contextual panel, build iteratively with live sideloading in your Outlook client, run cross-client QA, and deploy via AppSource or M365 Admin Center rollout, with post-launch Outlook API compatibility monitoring included. The Microsoft Graph API powers these Outlook integrations for mail, calendar, and contacts; see our Microsoft Graph API service. When your Outlook add-in is ready to ship, we also handle AppSource submission and certification through our AppSource publishing service. For AI email drafting and reply suggestions, see our AI-powered Office add-in service.

The sales operations lead at a 70-seat SaaS company tracked a frustrating number: four out of ten customer emails never reached their CRM. Reps meant to log them, then a call ran long, then Friday came. We built a reading pane panel that recognises the sender, shows the matching deal, and files the thread with one click, built on the same plumbing as our HubSpot integration projects. Logging passed 90 percent within a month, and forecast reviews stopped opening with an argument about missing activity. Two details mattered more than the sync itself. The panel signs each rep in silently through Microsoft single sign-on, so there is no password prompt to skip past. And it behaves identically in Outlook on the web, where half the team actually reads mail.

An inbox tool is the right call when the work starts or ends with an email: logging, filing, replying, converting messages into tickets or tasks. It is the wrong one when the workflow only touches mail once a week, where a Power Automate flow costs less and does enough. And if your team has already moved its day into Teams channels, extend Teams instead. We build both and will point you to the cheaper option first.

If you want to see our Outlook work before booking a call, install Message Prettier, a free thread-cleanup add-in from our Outlook store. The build itself is documented in its case study.