This document summarizes Microsoft IT's approach to migrating collaboration environments from on-premises to Office 365. It discusses preparing for migrations through activities like building test environments, evaluating new features, and dry runs. When supporting migrations, Microsoft IT establishes response teams, keeps old systems available, and communicates closely with customers. Lessons learned include treating dry runs seriously, viewing migration as an iterative process, and taking opportunities to simplify customizations. The presentation provides examples from Microsoft IT's own migration to Office 365 and recommendations for others undertaking similar transitions.
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