migrate-exclaimer-outlook-addin-skill

Build and troubleshoot a private Outlook event-based signature add-in as an Exclaimer replacement, hosted on Azure Static Web Apps with an add-in-only XML manifest, OnNewMessageCompose, static signature JSON, Microsoft 365 admin deployment, DNS, Exclaimer cleanup, security review, and cross-client testing. Use when migrating away from Exclaimer or another signature relay, creating an Outlook signature add-in, diagnosing missing or duplicate Outlook signatures, provisioning Azure Static Web Apps/GitHub/Microsoft 365 deployment, or explaining client-side signature risks and limits.