Archiving means moving messages to an archive folder at scheduled intervals to free up the space in your mailbox. There are various reasons why it may be necessary to archive emails.
One way to back up the e-mail messages is to use the Outlook AutoArchive feature. AutoArchive is turned on by default and runs every 14 days.
You can change how often AutoArchive shall run, specify the Outlook data file (.pst) used to store archived items, and choose when items in your Outlook folders are subject to being archived. This guide describes how you can archive email using Microsoft Outlook 2007.
Steps to Archive Emails or Folders in Outlook 2007
Step 1: Open Microsoft Outlook 2007 and select “file” menu at the top and then click on “Archive” option from the drop down list.
Step 2: The “Archive” window will open then choose one of the following from, “Archive all folders to their AutoArchive settings” or “Archive this folder and all the subfolders” by clicking on the radio button at the top.
Now select the folder which you want to archive.