Then there’s the safety net. Windows Live Hotmail keeps messages for a few days even after they have been purged from the Deleted folder. You can restore these backup copies to the trash and undelete mail believed gone in a simple process.
Recover Deleted Hotmail Messages
When you delete an email message from your Outlook.com email, you can quickly recover it if it still in your Deleted Items folder.
Recover Permanently Deleted Hotmail Messages
If you can’t find the email you want to recover in the Deleted Items folder, the next place to look is the Recoverable Items folder. In some cases, you can recover items after you empty the Deleted Items folder. The items you select to recover are restored to their original folders. If a folder no longer exists, messages are restored to your inbox.
Prevent Outlook.com From Deleting Messages Automatically
You can stop Outlook.com from emptying your Deleted Items folder every time you sign out if you wish.