Hi Guest. Welcome to the new forums. All of your posts and personal messages have been migrated. Attachments (i.e. images) and The (Old) Classifieds have been wiped.
The old forums will be available for a couple of weeks should you wish to grab old images or classifieds listings content. Go Here
If you have any issues please post about them in the Forum Feedback thread: Go Here
In order to keep your account secure you should probably enable two-step authentication via email or an app. Go Here