If you selected Run Diagnostics on the Review screen, the utility validates your configuration and users list before you run the migration. This validation helps to prevent migration errors or a failed migration.
What is validated
The diagnostic tests validate the following:
Connection to Microsoft Exchange Server or IMAP server
Administrator privileges for the credentials you provided
Format of the users list CSV file
Whether users in the users list exist on the Exchange or IMAP server, and whether their
mailboxes are accessible using the administrator credentials you provided
The utility initially checks only the first 10 users in your users list. After the diagnostic test completes, you can validate the entire user list. See “Validate entire users list” on page 53.
Whether users in the users list also exist in Google Apps
Connection to the Google Apps server
OAuth consumer key and secret you provided, if applicable