in Outlook, go to your email folder list, and then click Deleted Items.

Make sure Home is selected, and then click Recover Deleted Items From Server.
IMPORTANT: If Recover Deleted Items From Server is grayed out or isn't there:

You might be working in offline mode. To work online, see Switch from offline to online mode.

You might not be using an Exchange account. To check, see How do I tell if I have an Exchange account in Outlook. If you don't have an Exchange account (for example, you're using Outlook to connect to an IMAP or POP account) you can't recover an item that's been permanently deleted or deleted from the Deleted Items folder. If you are connected to an IMAP account, you might be able to recover items from the Trash folder. See how: Restore deleted messages when using an IMAP account.
Select the item you want to recover, click Restore Selected Items, and then click OK.
You can recover email messages, contacts, calendar items, and tasks from the Recoverable Items folder.

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