Find the location of your saved emails using the "regedit" application above. Using Microsoft Explore, click down the directory tree until you reach MAP's doc directory. Double-click on the "doc" icon, and you will see a directory (or file folder) called "000000". Right-click on this file folder, and click on "Properties..." and then "Advanced". The following menu will appear:
Click on "Compress contents to save disk space", click "OK" and then tell Windows to compress this folder and any sub-folder. Click "Apply" and Windows will immediately begin to compress this data as well as any new email that MAP adds to this directory. Most people will see about a 50% savings in disk space using this method.