Office 365 tenant to tenant migration becomes necessary during specific business scenarios. Common examples include mergers and acquisitions, where two companies need to consolidate their Office 365 environments to improve collaboration. Similarly, during divestitures or spin-offs, a business unit might require its own tenant to operate independently.

Other situations include rebranding, where a company might want a new tenant to reflect its updated identity, or regulatory requirements that necessitate data separation. Understanding the reasons behind the migration helps in tailoring the process to meet organizational goals while minimizing disruptions to operations.