Introduction to Outlook Data Files (.pst and .ost)
https://support.microsoft.com/en-us/office/introduction-to-outlook-data-files-pst-and-ost-222eaf92-a995-45d9-bde2-f331f60e2790
The fastest way to open the folder where your Outlook Data Files (.pst and .ost) are saved is to do the following: In Outlook, click the File tab. In right pane, click Account Settings, and then click Account Settings. On the Data Files tab, click an entry, and then click Open Folder Location.
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