The batch files DCPASS and DCFAIL should be found in the \DCASP directory.

Copy them to that directory and all should work as per spec.

Well, since I vaguely remember DOS....

First, is COMMAIL a DOS or Windows program?

Next, could you run the MEM command from within ACCPAC Plus? A proper test would be to put the MEM command in a batch file and run that from the Start List. (Don't forget the PAUSE ). You might not have as much memory when ACCPAC Plus is loaded.

There might be something about the amount of memory available as a default. Perhaps you might find someone else that has seen this behaviour by posting it in the ACCPAC Plus Forum on PlusCommunity.