Yes, it is possible to read PST files without installing Outlook on a Mac. Since PST files are proprietary to Outlook, macOS does not natively support them, but you can still access their contents using alternative methods.

One common approach is to use a dedicated MSOutlookHelp PST viewer tool. Many third-party applications are available that allow Mac users to open and read PST data such as emails, contacts, calendars, and attachments without Outlook. These tools typically scan the PST file and display the mailbox in a structured format for easy viewing.

Another option is to convert the PST file into a Mac-supported format like MBOX or EML. After conversion, you can open the data using email clients like Apple Mail or Thunderbird.

Web-based PST viewers are also available, allowing you to upload and preview PST data without installing software.