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Steps to take:
1. Open Outlook via the web or through application (OWA).
2. Highlight the email you want to delete.
5. If asked, confirm you want to delete the email.
Notes:
Once you delete the email, the email is moved to your Deleted Items folder. If the email is deleted out of that folder, it’s gone from your email. If you accidentally do delete an important email sometimes that email is still recoverable from the server.