Customers and partners can, in addition, buy their own test tenant in production based on a copy of their production data.
The test tenant may be replaced with a newer copy of their production database upon request.
You don't need the same amount of user plans in the test environment. We assume most will have just a few test users/developers with access to the test tenant.
The test environment is a dead end. We will not make it possible to migrate data back into the production environment from this test environment.
The production test environment is not a backup! We will clean up in the copied production database and also remove all mailboxes used by Service there.