Create an Outlook Data File (.pst) to save your information
https://support.microsoft.com/en-us/office/create-an-outlook-data-file-pst-to-save-your-information-17a13ca2-df52-48e8-b933-4c84c2aabe7c
WEBIf your online mailbox is nearly full, you can export some items to an Outlook Data File (.pst). You can also use these files to create archives, project files, or backups from any Outlook account. To learn how, see Export or backup email, contacts, and calendar to an Outlook .pst file.
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