I will be removing the "Conversations" feature from the forum and replacing it with a more traditional type of mail inbox. The benefit of Conversations was that they allowed for multiple users in the same thread, but I looked at the stats and pretty much nobody uses that feature. Switching it to a more traditional system where mail messages are sent off to individual users will make things a bit easier on my part, and also help with integrating the account mail system into the My Colony private messaging system.
I will not be deleting your old Conversation messages though, so do not worry. Once the new mail system is in place, the existing "Conversations" will simply become read-only.