Deleting messages keeps them in the mailbox and on the server. How can they be removed from the server to reduce the quota? Check all that apply. Left-click each message, and move it to the Trash folder.
Right-click the Deleted Items folder, and click Empty Folder.
Click the Folder tab, and click the Empty Folder in Clean Up group.
Right-click the Deleted Items folder, and click Mark All as Read.
In Backstage view, choose Cleanup Tools. Then, click Empty Deleted Items Folder.