Hi see:
Procedure to export emails as individual .EML files from Shared Mailboxes?

EnterpriseArchitect
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Using Exchange Online as Global Administrator, How can I export the email based on specific Sender and Recipient from a shared mailbox as individual .EML files?
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Andy David - MVP 157.8K Reputation points
2023-03-28T11:31:42.5466667+00:00 Run a compliance search based on the criteria you want against the mailbox and export: