Summary Currently, Microsoft Fabric Lakehouses store data in OneLake, logically centralized by region and capacity. However, there is no Microsoft-supported mechanism to transfer or migrate Lakehouse data across tenants, even when both tenants are owned or controlled by the same organization. This idea proposes a Microsoft-managed, support-driven cross-tenant transfer capability, where access to both tenants can be validated and a secure migration can be performed. Problem Statement Many organizations operate multiple Microsoft Entra tenants due to: Mergers and acquisitions Regional or regulatory separation Divestments or tenant consolidations Managed services and partner-led implementations Today, moving Fabric Lakehouses or OneLake data between tenants requires manual, unsupported, or fragile workarounds, such as: Exporting and re-ingesting data Custom pipelines with duplicated storage costs Breaking lineage and governance metadata Additionally: Governance objects (lineage, shortcuts, permissions) are lost Support cannot officially validate or assist with cross-tenant migrations Large datasets make re-ingestion slow, risky, and expensive Proposed Solution Enable a Microsoft-supported cross-tenant OneLake transfer process, initiated via a support ticket or controlled workflow, with the following characteristics: Validation of administrative access to both source and target tenants Same-region or approved cross-region transfers Secure, audited data movement at the OneLake level Optional inclusion of: Lakehouse metadata Directory structure Table definitions Shortcuts and references (where applicable) This could be implemented as: A Microsoft Support-assisted operation A Fabric Admin or Tenant-level migration workflow Or a future Fabric-managed migration service Business Value Reduces risk and cost for tenant consolidation projects Enables cleaner M&A and divestment scenarios Preserves governance, lineage, and Fabric-native structures Avoids data duplication and unnecessary storage costs Aligns with OneLakeโs vision as a unified, logical data lake Who Would Benefit Enterprises with multiple Entra tenants Partners and MSPs managing Fabric for multiple customers Organizations with M&A activity Regulated industries needing structured tenant separation Additional Notes This feature would not need to be self-service initially. A controlled, support-driven process would already deliver significant value while maintaining security, auditing, and governance guarantees.
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