I have a large forum that has more then 70K pages so far.
Many are quite old, but good for research, but bad for search engines index.
Google index only the first 40.000 pages and it's taking couple days to search my whole site.
Well, I was thinking if I could break the forum, putting the messages 2 years old or more in a different folder/forum (not sure), that I will block from Google to visit, but would keep open for the users to search.
Is that possible? any one else had/have this problem?
What would be solutions?

I thought about duplicating the database, installing a new sub-directory with a second second of the forum programs (not sure if it would break the license ), then delete the messages older then 2 years and create entry points to the second forum.
BUT: then what to do next time? I don't know how to 'merge' the 2005 messages next year, when that will be 2 years old, on the old original database.

Any ideas would be appreciate.