With the release of ERDAS APOLLO 2016, there were changes in the preparation of an MS SQL database that failed to make it in the final release of the documentation. In order for ERDAS APOLLO 2016 to connect and work with a MS SQL database, the MS SQL Native Client application must be installed on the same server that ERDAS APOLLO is installed on.
Please review the online documentation where the latest information or changes are published for more information. That site is: http://www.hexagongeospatial.com/support/documentation . The changes for this notice are in the ERDAS APOLLO Installation and Configuration Guide. Look in the "Installing and Configuring ERDAS APOLLO --> Before You Install --> Preparing Your Database section for the correct information.
If you have any questions, concerns or issues please contact Hexagon Geospatial Support.