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I have the same question (0)Hi Japascoe,
Going through the Implementation Guide - Planning you can see the following being specified for both your SQL Server installation as well as the Reporting Services :
Any one of the following Microsoft SQL Server editions is required and must be installed on Windows Server 2008 (x64 SP2 or R2) versions or Windows Server 2012 64-bit-based computers, running, and available for Microsoft Dynamics CRM:
• Microsoft SQL Server 2008, Standard Edition, x64 SP3 or R2 SP2
• Microsoft SQL Server 2008, Enterprise Edition, x64 SP3 or R2 SP2
• Microsoft SQL Server 2008 Datacenter x64 SP3 or R2 SP2
• Microsoft SQL Server 2008 Developer x64 SP3 or R2 SP2 (for non-production environments only)
• Microsoft SQL Server 2012, Enterprise, 64-bit SP1
• Microsoft SQL Server 2012, Business Intelligence, 64-bit SP1
• Microsoft SQL Server 2012, Standard, 64-bit SP1
As the guide does not offer any interdiction of using different versions of SQL for your 2 servers (one that handles the CRM DBs and the other server that handles the Reporting) - as long as the 2 versions are mentioned in the above list - I would say that the scenario you've described is Supported.
Thank you for using Microsoft Dynamics CRM Communities
Cezar Lozici
Support Engineer
Microsoft Dynamics CRM