I would suggest you Mac OLM to PST Converter The tool can easily convert multiple OLM files to PST format including HTML formatting, Attachments, Images, Links, and etc. The software is designed with a powerful algorithm to perform hassle-free conversion of entire OLM files and its associated data items. The tool provides a filter option to make a selection of the email items using different criteria such as To, From, Date, Subject, Attachments, etc.