Utilities rely on GIS to serve as the system of record for asset data, to support data maintenance, facilitate the sharing of information, and provide crucial data to other business systems. Many utilities have invested in the Esri ArcGIS suite and have been using traditional data structures to model their assets and to support key functions such as data visualization, network analytics, and modeling. Esri’s Utility Network (UN) solution provides more effective data modeling and visualization, improved field capabilities, and use of service-based GIS architecture. The transition to this solution represents a significant change for utilities with unique data schemas, custom tools, legacy applications, and established integrations. This presentation will provide best practices for those preparing to migrate from their legacy utility data models to the UN and will also discuss key considerations related to upgrading legacy GIS tools and workflows, as well as impacts to integrations.