Are threads purged, or are you only not seeing old ones because they're filtered out? Check the bottom of the forum in question, there should be a little pull-down box which enables you to see threads since the beginning (default may be since 30 days ago). I think that's a one-time change, but that you can permanently change it through your account settings somewhere.
Check the bottom of the forum in question, there should be a little pull-down box which enables you to see threads since the beginning (default may be since 30 days ago). I think that's a one-time change, but that you can permanently change it through your account settings somewhere.