I would like to suggest you to use third-party Mac OLM to PST Converter tool to successfully migrate OLM file to PST file format. which is very efficient software that can easily convert Mac OLM files to various save formats like PST, EMLX, MBOX, PDF, HTML, MSG etc. It guarantees 100% data security and does not guarantee any data loss or file modification. You can also preview the files before converting them.