If you are accessing your email through the Outlook Web App (in your internet browser)
In the left pane, select the Deleted Items folder, and click on the message you want to recover. Then, click Restore.
If you can't find an item in the Deleted Items folder, try looking in the Recoverable Items folder.
In the left pane, select the Deleted Items folder. At the top of the message list, select Recover items deleted from this folder. Select the items you want to recover, and click Restore.
The recovered items will be restored back to the original folder.
If you are accessing your email through Outlook on your computer
1. Click the Deleted Items folder in the left pane.
Important: If you do not see a Deleted Items folder, but see a folder called Trash instead, your account doesn't support recovering an item that's no longer in your Deleted Items folder.
2. On the Home tab at the top of the Outlook window, select Recover Deleted Items From Server.
If this option does not show up, your account does not support recovering an item that's no longer in your Deleted Items folder.
3. Select the item or items you want to recover, select Restore Selected Items, and click OK.
The recovered items will be restored to the deleted items folder, where you can then move the message back into your inbox or another folder.