So, after weeks of trying to migrate the forum to my the new platform that will upgrade my site, Drupal, it seems that the forum will stay on the YaBB platform (the current one).
There hasn't been a decent mechanism to help with the migration so I decided to get the only one that was somewhat working and started developing it to meet my needs. After one or two weeks of coding and testing I got to a point that the users, boards and threads get successfully migrated. The result looks like this :
However there are a lot of issues that don't seem to be fixable right now..
Etc. Private messages would have to be left behind, also bbcode is not working correctly, there are date related issues that affect the topics' sorting plus there's no way to migrate the quotes, images, smileys, signatures and a lot of other stuff..
And even if those were possible to migrate successfully, member roles, access and anti-spam settings are a real nightmare in Drupal and since time is really pressing on me lately it's impossible to deal with them for now..
So, I'll contribute all my upgrades on the migration code to the Drupal community and maybe someone else decides to pick up from where I leave it and continue to develop it to a state that we may be able to use later on..
As a result we'll be sticking to our beloved YaBB forum platform that has proven to be rock solid and stable for years now.
Maybe I'll give it a face-lift but firstly I'm focusing on upgrading the rest of the site to the Drupal and breath new life to it.