for a more detailed report you can look at the PstMigTask, PstLocTask, and PstColTask, report files in your Enterprise Vault\Reports folder.
for each migrated PST you would see something like this:
Migration of PST: \\EVSERVER\D$\Users\John.Smith\PST Files\Archive.pst
Migration Settings
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Migration Start Time: 8/5/2012 4:11:07 AM
Migration End Time: 8/5/2012 4:21:07 AM
Migration Copy File: \\EVSERVER\D$\PST_Temp\Copy3.pst
Shortcut Mode: Create shortcuts and move them to Exchange Mailbox
Include Deleted Items: true
Set PST Hidden: false
Set PST Read-Only: false
Compact PST: false
Delete PST: true
Archive Non-Expired Calendar Items: false
Cancel Mailbox Auto-Archive: true
Merge PST Folders: false
Migration Results
-----------------
Number of folders processed: 7
Number of items archived to vault: 1177 of 1177
Number of items moved to mailbox: 1177 of 1177
- Number of archived items moved to mailbox: 1177
- Number of other items moved to mailbox: 0
PST Migration completed successfully
8/5/2012 4:21:07 AM Completed migration of PST: \\EVSERVER\D$\Users\John.Smith\PST Files\Archive.pst