pst files, also known as Outlook 97-2002 Personal Folders Files, were the standard personal folder format for saving data in Outlook for Windows in versions 97-2002. pst files which are the standard format for Personal Folders files for Outlook (for Windows) 2003 and later versions. (The imported items appear in the navigation pane under On My Computer.)

Locate the data file on your computer, and then click Import.Select a data file type, and then click the right arrow.Click Outlook Data File, and then click the right arrow.On the Outlook for Mac File menu, click Import.Outlook Data Files are frequently used as an archive or to transfer data between computers.

These data files can contain large amounts of data of multiple item types. You can import an Outlook for Windows Data File (.pst) or an Outlook for Mac Data File (.olm). You can import e-mail messages, contacts, and other items into Outlook from other applications such as Outlook for Windows and Entourage.