Deleted items are recovered within 15 days, if you have permanently cleared out your deleted folder

STEP 1: Highlight your deleted folder

STEP 2: Click on Folder at the top 

STEP 3: Recover Deleted Items 

STEP 4: Click the circled button below to select all, or manually select individual emails

STEP 5: After the emails have been restored, move the emails from deleted folder to inbox by dragging and dropping select emails into your Inbox folder, or press Ctrl and click first and last email to select a group or more than one.