Moving folders from Outlook web app to Thunderbird

  1.  Click on Manage Folders on the left panel.
  2.  Click on Download Mail.
  3.  This will prompt you for a location to save your mail folder which will be a zip file. Depending on the size of your mail folders, this may take a while.
  4.  On your local machine locate the Mail > Local Folders folder under Thunderbird profile. Information on the Thunderbird profile folder can be found at http://kb.mozillazine.org/Profile_folder_-_Thunderbird
  5.  Unzip the mail folder and copy the contents to the Thunderbird Local Folders folder from step 5.