Yes, you can batch convert OST to PST for multiple users, but not through Outlook’s manual export option. Outlook handles one profile at a time, which makes bulk conversion slow and complicated. To batch convert OST to PST, you need a tool that supports adding multiple OST files at once. For example, SysInfo OST to PST Converter allows you to select several OST files or an entire folder and convert them into PST format in one go. It keeps each user’s mailbox data separate, maintains folder hierarchy, and preserves emails, contacts, calendars, and attachments.