User view: Shows a list of users that were migrated and indicates whether any failures occurred in the migration of email, calendar events, or contacts. If any errors occurred, you can click links on the report to open additional pages that show details about the error.
Error view: Shows a list of all the errors and the number of users or messages for which a error occurred. You can click links on the report to open additional pages that show details about specific errors.
Open migration reports
When you open a report, it appears in a new window in your web browser.
Note: Be aware of the following limitations to viewing reports:
To generate reports, Google Apps Migration for Microsoft® Exchange first opens a command console window, which then starts a reports server on the machine on which you run the utility. Be sure to leave this console window open.
If you open a report while you are running a migration, the migration may fail.
Google Apps Migration for Microsoft
Exchange Administration Guide