With the release of Exchange 2010 SP1, we introduced the /hosting mode switch – a feature which deploys Exchange using an Active Directory structure that affords complete separation between tenant ...
Updated Jul 01, 2019
Version 2.0
Blog Post
@Peter - you are correct that we have changed our stance on supporting hosters who use enterprise. We're doing this to try and provide more features to hosters, rather than continue with a mode that limits features. Migration from /hosting to Enterprise will require a new forest deployment, that's correct.
The guidance we will provide will aim to make this as painless as possible.
@ Mohamed - If you deploy with SP1 it will not be supported I'm afraid. There are several key changes in SP2 that allow the features you need for a supported multi-tenant configuration using the Enterprise product. If you have a control panel vendor that has an SP1 solution, they would be able to offer you support in the meantime, if you do not, I would recommend you wait for SP2. It isn't that far away.