SharePoint Add-In Retirement in April 2026: London
Summary
Microsoft will permanently disable legacy SharePoint Add-Ins (both SharePoint-hosted and provider-hosted) on 2 April 2026, which will abruptly break any workflows, forms, or integrations that rely on that architecture. Run the Microsoft 365 Assessment tool immediately to inventory installed legacy customisations, score them by business criticality, and prioritise migration. Replace heavy custom code with SharePoint Framework (SPFx) for complex functions and use Microsoft Power Platform for simple forms and workflows; plan development, rigorous UAT, and staged deployment well before the cutoff. If internal resources lack SPFx expertise, engage external specialists early to avoid operational downtime and compliance risk.
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Microsoft
$1B+