Integration with legacy systems can be challenging, but Power BI consultants address this by leveraging middleware, custom APIs, or third-party tools to bridge the gap. They assess the system's data structure, identify compatibility issues, and implement ETL processes to standardize data formats. Power BI consulting services also focus on ensuring real-time or near-real-time data synchronization. By creating scalable, secure integration solutions, they help businesses modernize their analytics infrastructure while preserving valuable historical data. This ensures that legacy systems remain relevant within a Power BI-powered ecosystem.