One of the best and easiest solutions to convert OLM files to numerous file formats is the MacSonik OLM Converter. The software can also import OLM file formats to multiple email clients, such as Office 365, Gmail, Yahoo Mail, AOL Mail, Hotmail, IMAP, Thunderbird, Zoho Mail, and many more. Using its Duplicate-free Conversion feature, you can transfer OLM files into other saving options with no identical emails. Furthermore, you can import the files in batches to multiple email clients and file formats without any data alteration.