When performing an O365 Tenant to Tenant Migration, one of the most important best practices is to
thoroughly plan and assess the scope of the migration. Begin by mapping out all
the data, including emails, calendars, contacts, SharePoint sites, OneDrive,
and Teams data, that need to be moved. Understand your organization's unique
requirements, such as user access, data security, and compliance, to ensure
that the migration is smooth and minimizes downtime. It’s also essential to
audit existing configurations, permissions, and any third-party applications that
may need reconfiguration after the migration. Having a clear migration strategy
and timeline will help ensure that no critical data is left behind.