You can view historical actions in a specified mailbox by searching the mailbox audit log.
By default, for Exchange online mailboxes with E5/A5/G5 licenses, mailbox audit log events can be returned in audit log searches in the Microsoft Purview compliance portal.
To search for mailbox audit log entries for users who don't have E5/A5/G5 licenses, you can use either of the following workarounds:
- Manually turn on mailbox auditing for individual mailboxes: Set-Mailbox -Identity <MailboxIdentity> -AuditEnabled $true
- Use the New- MailboxAuditLogSearch/ Search-MailboxAuditLog command in Exchange Online PowerShell to search.
- Use the Exchange admin center (EAC) in Exchange Online to do the following actions:
You can refer to this table to view the actions recorded in the mailbox audit log:Manage mailbox auditing - Microsoft Purview (compliance) | Microsoft Learn
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