Office 365 (Outlook 2011 Mac) - Delete a Message / Recover a Deleted Message
Delete a message
• In the message list, right-click on the message and click Delete.
• In the message list, select the message (it will be highlighted), then click Delete button within Home tab.
• If a message is open in its own window, click Message > Delete.
When a message is deleted, it's 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.