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Based on Microsoft documentation, a message sent from a shared mailbox can be recalled in Exchange Online.
In my testing:
1.When the message was stored in the shared mailbox's Sent Items folder, the Recall option was grayed out in Classic Outlook, whereas it was unavailable in New Outlook.
-Classic Outlook
-New Outlook:
2.When the message was stored in the authenticated user's Sent Items folder, the Recall option was available in both Classic Outlook and New Outlook.
-Classic Outlook:
-New Outlook
You can also review the AI-generated answer, as it covers the prerequisites, limitations, and steps for recalling a message, including considerations specific to shared mailboxes.
I hope this helps clarify the recall behavior for messages sent from a shared mailbox.
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