ArcGIS server versions users count
Production at 10.2.2. Testing 10.4.x with plans to upgrade this fall/winter to that or maybe 10.5. ??
We remain stuck at 10.2.2. We want to upgrade to 10.3 or 10.4, but our GIS is intertwined with Infor's InforEAM Software. Infor lags 2 - 3 years behind ESRI for version compatibility, plus on a side note, sorry...ranting... Infor's GIS Documentation is incredibly confusing what with their intertwining of ArcIMS and ArcGIS for Server terminology. Infor is an ESRI Business Partner.
I'd personally recommend that all users be at 10.2.2 or higher for the simple reason that we periodically release general patches for issues like newly discovered security 'quirks', and 10.2.2 is the lowest version we release patches for.
ArcGIS Server Security Patch (2016 Update2) | ArcGIS Blog
Need to add options 10.4.1 and 10.5 to this poll
Retrieving data ...