How to delete/reset mailbox database via m365?

Question

how to reset/delete mailbox exchange on premise via m365 (exchange and m365 are synchronized with each other)? I want to reset/delete user mailbox via m365 because exchange can't be opened

Answer 1

@Aura Salvia Gayatri

Exchange on-premises mailbox can only be managed from local AD. You could manage Office 365 mailbox (Remote mailbox) from Exchange on-premises, but you cannot manage Exchange on-premises mailbox from Exchange online side.

If you want to delete it when Exchange on-premises crushed, you could delete this mailbox AD account from local AD, or remove this mailbox from AAD Connector.

You can also follow this article to recover crushed Exchange on-premises server, then you will could manage this mailbox from Exchange on-premises.

---

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

---

Answer 2

Thats not possible from 365. If you are syncing from on-prem, any mail-enabled object needs to be deleted from on-prem.