Abstract
Large enterprises operating mobile application portfolios built on Xamarin face a strategic inflection point
following Microsoft's introduction of .NET Multi-platform App UI, announced at the Microsoft Build developer
conference in May 2021 as the evolution of Xamarin.Forms within a unified .NET runtime. For organizations
maintaining dozens or hundreds of Xamarin applications, migration to the new framework cannot be executed as
a single uniform project, since individual applications vary enormously in size, architectural complexity, third
party dependency exposure, and business criticality. This research article proposes a risk weighted migration
framework that segments a large enterprise mobile portfolio into prioritized migration cohorts based on a
structured, multi factor risk score, rather than migrating applications in an arbitrary or purely chronological order.
The framework combines a portfolio inventory methodology, a risk factor taxonomy covering user interface
complexity, custom renderer usage, third party library compatibility, platform specific code exposure, team skill
readiness, and test coverage, and a scoring model that converts these factors into a single weighted risk index per
application. The article further presents migration pattern options, a phased roadmap template, an effort estimation
model, and an illustrative simulation applying the framework to a representative sample portfolio, alongside
extensive supporting reference tables intended for direct reuse in enterprise migration planning exercises
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