We have identified two approaches to get to the target environment.
1) Windchill 8.0 to 9.1 M070 then Windchill 9.1 M070 to 10.2 M020
2) Windchill 8.0 to 10.1 M050 then Windchill 10.1 M050 to 10.2 M020
PTC official upgrade documentation states that "Install the LDAP server. When upgrading from release 8.0, you must use Aphelion for the upgrade and migrate Windchill Directory Server after the upgrade is complete."
PTC Article CS20502 emphasizes on the above statement.
So far, we have been able to import LDIF (successfully) from WC 8 into WC 10.1 with a few tweaks (after converting to Windchill DS format) and we're apprehensive about getting into issues with this during/after running the upgrade manager.
Any suggestion with known issues, risks and rewards?