This article explains in 3 simple steps how to use the Report Phishing button in the Outlook Web App (outlook.office365.com).
1) If you receive a malicious email that you wish to report to the ServiceDesk, select the email and click the three dots in the top right.
2) Click the 'Report Phishing' button.
3) That is it! The email is deleted from your mailbox, and is submitted to the ServiceDesk to be reviewed.
To see how to use the Report Phishing button in Outlook client, check out this solution article: Report Phishing Button in Outlook | Knowledge Base | CHRC Service Desk
To see how to use the Report Phishing button in Outlook mobile, check out this solution article: Report Phishing Button in Outlook Mobile | Knowledge Base | CHRC Service Desk