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 Smile.

http://technet.microsoft.com/en-us/exchange/hh563895

BLOG: Exchange 2010 Service Pack 2 and Hosting

http://blogs.technet.com/b/exchange/archive/2011/12/06/exchange-2010-service-pack-2-and-hosting.aspx

 

>hope this helps, and corresponds to expectations expressed since MS announced SP2.

LB