Forum Upgrading from Vbulletin 3.8.x to 4.0.x ....affect on SEO?
 

Does anyone know the affect this has on search engine rankings?

We have alot of pages spidered by Google (in addition to high google results) and since vbulletin 4 essentially changes the threads into key word tags in the url, this will essentially delete the thousands of pages we have spidered in google and create thousands of new spidered pages in Google almost instantaneously... this can possibly be detected as spam by Google robots and perhaps a penalty given?

Anybody can shed some light on this?

Sorry if this is the wrong forum to ask this.