MAIL AND DIRECTORY MIGRATION
Generate random passwords for all users (overwrite existing passwords)
Select this option to generate new random passwords for all migrating users, regardless of whether they already have a password available for import from the legacy directory. The migration tool generates passwords that conform to the password quality scale specified in the current registration preferences. If a migrating user already has a password imported from the legacy system, the new password overwrites it.

This option and the option "Generate random passwords for users with no passwords" are mutually exclusive. If you select one of the options and then attempt to select the other, an error message appears.