Does anyone know when sql 2008 r2 will be no longer supported
Jerry, I believed this in answered in your other post:
https://community.esri.com/thread/186625-when-is-arcgis-going-to-stop-supporting-ms-sql-server-2008r...
10.3.1 is the last release where it is supported. At 10.4, we no longer support this version of SQL Server