There are two ways to convert Access (MDB or ACCDB) files to CSV format.
Source database is also known as Access, Microsoft Access, MS Access
Target is a text file with values separated by comma, semicolon
or any character
MDB to DBF Converter can work as a wizard:
you select one or more source files (.accdb or .mdb), the output folder, and there are several options to customise the output file, such as type of memo fields.
or you can use command line interface:
it allows you to run the program with predefined parameters manually or using scheduler to automatise routine work.