You can view PST files on a Mac without installing Microsoft Outlook by using a dedicated PST viewer such as MacSonik PST Viewer . It allows you to open and preview PST files directly on your Mac and access mailbox data such as emails, attachments, contacts, calendars, and other folders. The tool is designed to let users examine PST data without requiring Outlook, which is useful when Outlook is unavailable or you only need to inspect an archive. It can also help users open PST files created by different Outlook versions and preview their contents before deciding whether to export or convert the data.