In the admin tools the view notification is real handy especially because it shows messages that were emailed instead of using the canvas inbox. You can select someone using their ID and a date range. The only problem is that when you get the info it shows on one screen and there is no way to export, save or any other options to manipulate the data.
I recommend giving us admins more options in sorting this information.
exporting/saving as a .csv
sort based on course
sort by topic
This would help greatly especially when helping Deans with student issues where we need to check the conversation and communication in the course.