Sorry, I've used RM-Cobol but not Micro-Focus. There are a number of compatibility option switches in the compiler but I didn't see Micro-focus mentioned specifically. I have converted 2 RM-Cobol systems to Acubobol with very few problems. I'm sure you have already tried this but why not just start compiling the programs and see what kinds of errors come up and then deal with them. If the programs were written in a fairly consistent manner, the changes would probably be mostly the same. I have used Acucobol for a number of years now so I will be happy to help. I'm just now starting to use Acubench though.
Ted