Outlook 2010 has a feature that allows users to automatically open next email in the folder after deleting an open email. This is useful when you want quickly read and delete emails in your folder. You can enable this feature using Outlook Mail Options.
Click the File menu then Options link. In the Outlook Options window navigate to Mail Options.
Scroll down to Other section in Mail Options and click the drop down “After moving or deleting an open item” and this would display the following list of options.
Now select open the next item from the drop down list. Click Ok button to confirm and save the changes.