How do I restore my emails that have been deleted by hackers

If Restore deleted emails is not bringing anything back, the messages were likely already removed from Deleted Items and may only be recoverable from Recoverable Items.

Try this on a computer, not in a mobile browser or mobile app:

1. Open Outlook.com or Outlook on the web.
2. In the left pane, select Deleted Items.
3. At the top of the message list, select Recover items deleted from this folder or the Recover button.
4. Select the messages to restore, then select Restore.

Important limits:

• Email is automatically deleted from Deleted Items after 30 days.
• Items removed from Deleted Items are recoverable for 30 days.
• In Outlook for iOS, Outlook for Android, and a mobile browser, messages removed from Deleted Items cannot be recovered there; use a computer.
• Messages deleted from a child's account cannot be recovered.

If the messages do not appear in Recover items deleted from this folder, they were probably permanently removed from the mailbox and cannot be recovered by self-service.

Since the account was hacked, also check for anything the attacker may have left behind:

• In Outlook settings, review Mail > Rules and remove suspicious rules.
• Check Forwarding and make sure mail is not being sent elsewhere.
• Keep two-step verification enabled and review account security settings.

References:

• Email is missing from your Outlook.com inbox | Microsoft Support
• Web
• How to recover a hacked or compromised Microsoft account | Microsoft Support
• Email hacked - emails deleted and junk has failed deliveries - Microsoft Q&A
• My Email account was hacked - how to recover lost emails in my inbox and my pinned emails pls? - Microsoft Q&A
• Hacker deleted mails completely - Microsoft Q&A