Exchange 2010 SP2: new Exchange Server 2010 Hosting and Multi-Tenancy Solutions and Guidance
Building a hosted Exchange 2010 environment using the new supported model in SP2 using this guidance brings in broader set of supported features to our hosting partners, such as Unified messaging 
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https://technet.microsoft.com/en-us/exchange/hh563895
BLOG: Exchange 2010 Service Pack 2 and Hosting
>hope this helps, and corresponds to expectations expressed since MS announced SP2.
LB