Forum Warning to those with imported forums vb 4.0.3
 

After upgrading to 4.0.3 I lost all my redirects that were imported. This is around 20,000 urls that are dead 404 now. Does it matter? Well, google has reindexed most of my site since I upgraded to vb4, so its not so bad however,, all the urls that were links from other sites linking to our threads, are now 404. This is around 2000. Why did this happen? So many poblems happened when I upgraded to this rushed release.

This is what vbseo said after I asked if they could help find out why my urls are going 404.

Quote:
A staff member has replied to your question:

Looks like the importthreadid field in your database was reset, it set to 0 for the threads you references (and probably others). It might have happened during vB upgrade or similar procedure, and it's not possible to determine the link from old ID to new one without that field.