The approach and race against time to migrate Walgreens' mission critical retail inventory system with about a 100 terabytes of data from IBM Netezza to Azure SQL Data Warehouse, all before their looming end-of-support deadline. You'll see what it took to migrate to a production-ready state within a record three months and where they're going next.  At Microsoft Ignite 2019, this was session THR2282: How we built it: Walgreens migration from on premises appliance to Azure SQL Data Warehouse Anne Cruz makes a living by data processing and is passionate about leveraging technology to deliver business value and transformations.