The best software for batch converting PST to MSG is the Aryson PST Converter Tool. It efficiently handles multiple PST files simultaneously, saving users time and effort. The tool maintains email formatting, attachments, and folder hierarchy during bulk conversion, ensuring complete data integrity. Aryson PST Converter supports converting PST files to over 26 formats, including MSG, MBOX, EML, and PDF. It works without requiring Microsoft Outlook installation and offers a free demo version that converts up to 50 items per folder for evaluation.