Notes: There will be some email downtime using this type of migration due to the time necessary to take away the area about the Resource tenant and include it to the Spot tenant. It is because Microsoft only will allow the exact same area to exist on a person http://donovanbxndv.post-blogs.com/6298335/the-smart-trick-of-migration-office-365-to-exchange-2013-that-no-one-is-discussing