Migrate from Earlier Releases of Cisco Secure ACS to Cisco ISE
You can migrate earlier releases of Cisco Secure ACS data to Cisco Secure ACS, Release 5.5 or above, so that it can be migrated to Cisco ISE, Release 3.0, using the migration tool.
Migrate from Cisco Secure ACS, Release 5.x
If you are running Cisco Secure ACS, Release 5.x in your environment, you must upgrade to Cisco Secure ACS, Release 5.5 or above.
To migrate internal users from Cisco Secure ACS 5.x to Cisco ISE, you must install Cisco Secure ACS 5.5 Patch 4 or later, ACS 5.6, ACS 5.7 Patch 1 or later, or ACS 5.8, and then start the migration.