Office 365 Tenant-to-Tenant Migration Best Practices

Hello Everyone,

I’m currently working on an Office 365 tenant-to-tenant migration project and would like to get recommendations and insights from the community based on real-world experience.

The goal is to ensure a smooth migration with minimal downtime and user impact. I’m currently reviewing areas such as tenant preparation, DNS and mail flow planning, identity management, licensing, MFA, and Conditional Access policies.

I would also like to understand:

• Important prerequisites before starting the migration
• Best practices for source and target tenant preparation
• Common issues faced during migration
• Steps to validate the environment after migration
• Recommendations to reduce migration risks and downtime

If anyone has handled similar migrations, please share your suggestions, lessons learned, or things that should be avoided during planning and execution.