I recommend using the PST File Viewer utility if you want to read PST files without Outlook. The PST file’s contents, including contacts, emails, calendars, journals, tasks, and events, can be read and viewed using this freeware application, which scans the PST and its mailbox data items. It enables you to view a preview of all the data items and attachments in your mailbox. It supports all Windows versions and can export saved PST file data in HTML format.