For the hosted model, customer data is stored in a separate instance of a SQL 7.0 database. None of our customers' data is co-mingled.  Our licensed model will support usage of SQL 7.0 and SQL Server 2005 or later.
FuzeDigital houses all of our hosted clients with MS Azure. 

We also offer a licensed model for those clients that prefer to run our application on their own servers.  Contact us to learn more.