If one would like to include both the Exchange Messages At A Glance part and the Exchange User Messages At A Glance part in the Corporate Exchange At A Glance report, there is no way to know to tell which part is which apart from the fact that Exchange message counts are larger than the User Message counts.
STATUS
Enhancement Request TF00178949 to modify the images to say "Exchange Messages" and "User Messages" has been raised to be addressed in a future release of MessageStats.
WORKAROUND
Configure the parts by checking the Show Part Header checkbox in the Configure Settings for Part dialog. This would make the part name and description appear for each part which would make it possible to tell them apart
