To transfer messages and other items from a Windows-based computer to a Mac, Outlook for Mac can import Outlook Data Files (.pst) that were created in Outlook for Windows.
Note: This feature is available only in the legacy Outlook client for Mac.
Transfer a .pst file from Windows to Mac
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On the Outlook for Mac File menu, select Import…
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Choose Outlook for Windows archive file (.pst), and then choose Continue.
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Locate the data file on your computer, and then choose Import.
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When the import process is complete, choose Finish.
The imported items appear in the navigation pane under On My Computer.