Apply a retention policy to mailboxes in Exchange Online
https://docs.microsoft.com/en-us/exchange/security-and-compliance/messaging-records-management/apply-retention-policy
Apr 19, 2022 · Navigate to Recipients > Mailboxes. In the list view, select the mailbox to which you want to apply the retention policy, and then click Edit . In User Mailbox, click Mailbox features. In the Retention policy list, select the policy you want to apply to the mailbox, and then click Save. Use the EAC to apply a retention policy to multiple mailboxes
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