Microsoft kills legacy SharePoint add-ins ahead of 2026 deadline

6 Apr 2026

Microsoft retires legacy SharePoint add-ins on April 2, 2026, after blocking new installs in 2024. Admins must shift custom web parts and integrations to SPFx or Power Apps via unified Apps site. This cleans up slow, insecure legacy features, aligning with New SharePoint for reliable intranets.

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