SharePoint Online (Office 365) migration between two Tenants was recently performed for a client. Following are the project features:
Metalogix Content Matrix Migration Express Console (Free version with 25 GB limit)
1. OneDrive for Business (personal contents) were not migrated over. [Only team collaboration contents were migrated]
2. Board group had external users. Their @Tenant2.com emails were added to the group. They needed to sign-up using that email and create a password to login to the site
3. Tenant1 users need to switch their desktop OneDrive For Business client links to the Tenant2 site. Else they will loose that data in their OneDrive for Business after Tenant1 SharePoint Office 365 is closed.
4. Tenant1 users need to update their desktop Microsoft OneNote files that were pointed to the old Tenant1 SharePoint online site to the new Tenant2 SharePoint Online.