Outlook 2010′s Clean Up Feature

How many times do you get a lot of back and forth emails that are completely unnecessary to keep?  Outlook 2010 offers a new feature called Clean Up, which deletes redundant messages in a conversation, and keeps only the most recent.  This is helpful because the most recent email contains the thread of all of the quoted replies in it.  Therefore, there is no need to keep all of the other emails, when their contents are quoted in the last email.
On the Home tab, click on the Clean Up button to see the menu of options available.  See the screenshots below.

Outlook 2010's Clean Up button and menu options

Outlook 2010's Clean Up button, condensed view

These are the menu options:

• Clean Up Conversation only cleans up the conversation that is selected.
• Clean Up Folder cleans up all of the conversations in the currently shown folder.
• Clean Up Folder & Subfolders cleans up all of the conversations in the current folder and its subfolders.