Confirmed, I looked into the database.
OLDer (between 2007 and June 2012) passwords in OTRS are saved in plaintext
This means that in Zammd only the newer accounts with a hash
instead of the plaintext password will work after import.
Solutions:
- Make users change their password before migrating from OTRS to Zammad.
- Let users use the recover password functionality in Zammad after the migration