Upgrade premium100 2014 to 201X - SQL Server 2008 R2 Limitation?

We are currently running Sage 100 2014 premium edition with SQL Server 2008 R2 Standard.

I am looking to upgrade to 2016 or 2017 in the next month or so.  I was double checking the 2017 Supported Platform Matrix and noticed that it did not mention SQL Server 2008 R2 as supported (only mentions 2012 & 2014).  Does anyone know if 2008 R2 is officially not supported or did the just not list it because it is older?  We run SQL Server 2008 Standard for a few other databases and I'm really not wanting to throw in another investment item at the end of this year.  (Currently using 4 cores with 2008, so almost $15k investment just for licensing)

Sage 100 2016 does list SQL Server 2008 so I know I could at least upgrade to that, but am trying to get to the latest version if possible.

Thank you