I just did some URL rewriting to redirect my old archive from this (and another hack) to all go to the new vB3 archive... Search Engines and traffic haven't missed a beat....
Since the new & old archives use a different amount of pages & posts per threads, I didn't do exact page redirects, only threads...
Anyhow, here's my 4 rewrites... 2 for one other old archive hack , and 2 for this archive hack.
Code:
RewriteCond %{REQUEST_URI} ^/archive/forum/(\d+)-(\d+)
RewriteRule ^/archive/forum/(\d+)-(\d+) http://forums.yoursite.com/archive/index.php/f-$1 [R=301,L]
RewriteCond %{REQUEST_URI} ^/archive/topic/(\d+)-(\d+)
RewriteRule ^/archive/topic/(\d+)-(\d+) http://forums.yoursite.com/archive/index.php/t-$1 [R=301,L]
RewriteCond %{REQUEST_URI} ^/forumdisplay/f-(\d+)
RewriteRule ^/forumdisplay/f-(\d+) http://forums.yoursite.com/archive/index.php/f-$1 [R=301,L]
RewriteCond %{REQUEST_URI} ^/showthread/t-(\d+)
RewriteRule ^/showthread/t-(\d+) http://forums.yoursite.com/archive/index.php/t-$1 [R=301,L]