If you are trying to convert Mac OLM files to PST, EML, and MSG formats then  I would like to recommend you this software. It easily convert OLM files into PST files and save them into PST, EMLX, MSG, HTML, PDF etc. This tool also recover data from corrupted OLM files of any size. This tool can recover data from severely corrupted OLM files and recover data in any file format as mentioned earlier.