If you accidentally deleted an email from Outlook over 30 days ago, perhaps you can recover it in a few steps. First, check the "Deleted Items" folder in Outlook. If it's not there, check the "Recoverable Items" folder by going to the "Folder" tab and selecting "Recover Deleted Items." If the email isn't in either of these folders, consider using a third-party recovery tool like DataNumen, Outlook Repair, or Stellar Data Recovery for Outlook. In the future, regularly back up your Outlook data to avoid losing important emails.