Board Thread:New Features/@comment-26339491-20191016152503/@comment-26339491-20191025231347

I don't actually have an answer for that, since the script that will do the migration from Forum to Discussions content isn't written yet. Some details on how it will work still need to be figured out.

After the migration, the newly moved posts in Discussions that used to be Forum posts won't have any visual indication that they came from the Forums, but in some cases, you'll still be able to tell. You might see formatting that can't be done with the Discussions editor, you might see templates, you might see posts by anonymous users, which Discussions doesn't allow. Unless admins later re-name and consoliate categories, you may also be able to tell what used to be Forum content via the category the posts are in.

We aren't planning on adding any flags like "hey, this used to be a Forum post!", though, since that wouldn't really tell many users anything valuable.