It was not possible to migrate the old forum with all the data.
Users and user groups are migrated but all the passwords had to be reset.
To be able to use the old user in the forum(and on the website) you have to reset your password with the link ‘I forgot my password’ in the login form.
After you got the new password you can change it on your profile page to whatever you want.
If the email on the old user is no longer available then send me an email and I will change email address so you can retrieve a new password.
Se links at on the ‘Contact us‘ page.