Forum system - how to track already read vs new messages, per user

[eluser]xwero[/eluser]
Instead of moving parts to a wiki why not let the users bookmark posts and when the time has come to remove the thread leave the bookmarked posts and the thread record if there are any.

Then you can split up the search in recent threads and bookmarked threads. The bookmark search will be more useful i think because the content is filtered. If you allow it members can revive the thread as a new one based on the bookmarked item.