MS Access datasource is no longer supported, however loegacy support remains and the , "MS Access" option is still present when it comes to selecting a foreign datasource in the ODBC Dataserver migration utility in OpenEdge 10.x and later releases. By design, the ODBC DataServer design is supposed to be open to any target whether it is "supported" or not. The documentation will be updated to provide better guidance regarding this unsupported datasource and limitations when it comes to legacy support (PSC00345775).
References to other documentation:
OpenEdge Data Management: DataServer for ODBC
000001149, "Which data sources does Progress Dataserver for ODBC support?