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So would I be correct in saying &nbsp;that Microsoft supports the “co-mingling” of 2008 and 2012 servers as long as the DC’s are one or the other.
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So would I be correct in saying  that Microsoft supports the “co-mingling” of 2008 and 2012 servers as long as the DC’s are one or the other.

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I am going to upgrade our current SQL and SharePoint servers from Server 2008 R2 to 2012 R2. The reason is that we are already running SharePoint 2013 on one server and SQL 2008 on the other and want to upgrade the SQL 2008 to SQL 2012 for the enhanced reporting capabilities. our company has OK'd a project to purchase some new servers after the first of the calendar year. It is at that time that I will be up grading the domain (AD servers) to 2012.
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I am going to upgrade our current SQL and SharePoint servers from Server 2008 R2 to 2012 R2. The reason is that we are already running SharePoint 2013 on one server and SQL 2008 on the other and want to upgrade the SQL 2008 to SQL 2012 for the enhanced reporting capabilities. our company has OK'd a project to purchase some new servers after the first of the calendar year. It is at that time that I will be up grading the domain (AD servers) to 2012.

Will there be any issues upgrading one of my windows 2008 R2 servers to 2012 R2 within the same domain?

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.