By Syed Hussnain Sherazi | April 22, 2025 | Microsoft Fabric

Tags: Microsoft Fabric | Migration | Data Strategy

A phased migration plan for moving from on-premises reporting and data platforms to Microsoft Fabric.

A practical field guide from the first discovery conversation to go-live

Data migrations usually fail because of planning, not because the target technology is unusable.

Teams often underestimate the complexity of the existing environment, skip discovery, and try to move everything at once. Months later, they are over budget, behind schedule, and still running the old system in parallel because nobody is confident enough to switch it off.

Migrating to Microsoft Fabric does not need to follow that pattern. A good migration plan starts with the business context, makes dependencies visible, tests the process on a small workload, and validates carefully before cutover.

Before Anything Else: Understand What You Are Migrating From

The biggest mistake is treating the migration as a technology project from the first day. It is a business change project that involves technology.

Before you write migration code, you need to understand your current state in detail. This discovery phase is not optional.

Phase 0: Discovery and Assessment

Timeline: 2 to 4 weeks

The goal of this phase is to answer one question honestly: what exactly are we migrating?

Inventory your current data assets. Create a catalogue of every database, data warehouse, reporting system, ETL pipeline, and scheduled job that touches data. Include the owner, purpose, upstream dependencies, and downstream consumers.

Classify your workloads. Group workloads by:

• Complexity (simple table sync versus complex multi-stage transformation pipeline)
• Business criticality (core financial reporting versus rarely used operational report)
• Data volume and frequency (10MB daily batch versus 5TB incremental warehouse)
• Regulatory sensitivity (PII, GDPR, SOX, or other compliance requirements)

Identify dependencies. A single reporting database might feed 47 reports, three downstream applications, and an external partner feed. Understanding those dependencies prevents you from breaking something important during the move.