ECW for ArcGIS Server is a full release product that adds the ability to serve ECW data via the ArcGIS for Server platform. All of the standard Esri® server capabilities are supported; this product merely adds format support.
Prerequisites: Esri® ArcGIS for Server v10.1 or v10.2 Highlights include: Expanded platform support for Esri 10.1 and 10.2 releases. Performance improvements over ECW for ArcGIS Server 2013. Improved deployment documentation.