If your MS Outlook archive file isn’t already shown in your Outlook email navigation pane, you can gain access to it by following these steps:
Click File | Open | Outlook Data File.
In the Open Outlook Data File window, navigate to where your archive file is (i.e. h: space or another network drive).
Select the *.pst file and click OK.
By default your email archive is located in your H: space. Many LSE students and staff find themselves short of space here. Now that all LSE email accounts have been migrated to Office365, and contain a 50GB mailbox, you may wish to free space in your H: space by importing your archived emails back into your Mailbox. If you need help with this process, please see our guide on Adding Archived email back to your Mailbox.