It's common to find an old PST file after uninstalling Outlook or moving to a new computer. Although the file still contains all of your mailbox data, Windows can no longer open it on its own. In this situation, SysInfo PST Viewer provides a simple way to access the file. After selecting the orphaned PST, the software scans it and recreates the original folder structure so you can easily browse emails, contacts, calendars, and attachments. More: https://www.sysinfotools.com/recovery/pst-file-viewer.php