Office 365 (Outlook 2019 for Mac) - Delete a Message / Recover a Deleted Message
Delete a Message
To delete a message, select the message then click on the Delete button.
Recover a Deleted Message
To recover a deleted message you can either select the message from the Trash folder, and drag and drop to it's previous location, such as the Inbox folder or you can select the message from the Trash folder. While selected, click the Move button to copy it to the new location.
When a message is deleted, it is moved to the Deleted Items folder.
If you want to bypass the Deleted Items folder and permanently delete a message, press Shift+Delete. You won't have an opportunity to change your mind later and recover the message.
Wait! I changed my mind!
If the message you want to keep is still in the Deleted Items folder, drag the message from the Deleted Items folder to another folder.