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This is of course the thin end of the wedge. One day it'll be other O365 products, like extra office 365 Premium licences. As a managed service provider, we rely on selling these to customers (usually small businesses), and for that we provide a service. If the customer can just bypass this can get their own licences (possibly cheaper), then we'll have to start saying "no, we can't support the new employee you just hired and bought your own licence for, bypassing us". It's just going to create more problems than it solves.