Discus is a message board software by DiscusWare. Migration from Discus boards to Drupal forums can be done in two or three steps. Some possible procedures are for example:
- Discus -> phpBB 2 -> Drupal
- Discus -> phpBB 2 -> phpBB 3 -> Drupal
- Discus -> vBulletin -> Drupal
Migration to Drupal via phpBB 2 or 3
For the Discus -> phpBB 2 step, see markus_freerela's converter on the phpBB discussion Discus 4 --> phpBB2 convertor, which also includes other converters. Markus' script has several versions that you can try, in order to find the most suitable for your board. Download links are: 2.0, 2.0.1, 2.0.2, 2.1.0, 2.1.1, 2.2.0, 2.2.1, 2.2.3, 2.2.4. To install the needed old phpBB2 version, see Download legacy release (phpBB, like Drupal, is open source).
Migration to Drupal via vBulletin
For the Discus -> vBulletin step, there are two modules for DiscusWare in vBulletin's ImpEx Import System: the older discus_file, and the more recent and probably more complete DiscusWare4Pro_tabfile. If Discus was using the optional database, you should export its data (users, etc.) to files with Discus Administration (Database Manager) before the conversion. Also, to export the posts to a tabfile (tab-delimited messages), see the Backup Manager. Two related threads are: 1, 2. If the Discus auto-archiving of messages was enabled, see this post for a workaround.
Features and performance
For a Drupal forum with features similar to those of well-known forum systems such as phpBB and vBulletin, see the Advanced Forum module.