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Outlook add-in development in 2026: why the new Outlook broke VSTO/COM add-ins, web add-in vs VSTO, real costs, AppSource, and how to migrate before it bites.
Excel add-in development in 2026: custom functions, task panes, API and database connections, when to use an add-in vs VBA or Office Scripts, and what it costs.
Word add-in development in 2026: content controls, document assembly, AI drafting, when to build an add-in vs generate documents server-side, and what it costs.
Office.js explained for developers: what the Office JavaScript API is, the proxy and context.sync model, requirement sets, SSO and Graph, and the gotchas that trip up web devs.
