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When companies use BI to better understand their business and customers, their first requirement is to trust their data. Nothing in BI works well if you don't trust your data. Is it clean? Integrated? Consistent? Up to date? Is it safe and secure? Is it always available, without undue delay, even for complicated queries? Is it accurate? Does it reflect your business logic? Cleansing, storing and serving trusted data is SQL Server's role in the Microsoft BI stack. The relational engine is the core.