robbydooo wrote:Apparently theres a fair few cases of forums vanishing off google for over 12 months when people have migrated from different forums.
I'm pretty sure it was not properly done. Even only migrating from phpBB2 to phpBB3 vanilla (no mod rewrite) is really risky since url do change without redirection, and worst, becomes more complex.
Migrating from phpBB2 url rewritten to phpBB3 url rewritten will most likely imply some redirecting, at least for few urls, but if you had duplicates and go for ours mods, they will be reduced by the zero dupe.
Most common issues when migrating like this are bad redirect (wrong headers, wrong new location or no redirect at all), lasting 404 for new or old urls (bad .htaccess) or bad robots.txt (for example disallowing the old url before the redirection are taken into account by bots), and all these can be fully tested before you go for real so it's only dealing with bad preparation and implementation ...
To my experience, redirecting (http 301) is not risky, it's only something to implement and thus prepare well, all you really want is to switch all the sudden and without hesitation, url should stay as redirected for a while.
We did redirect all the forum URL
(both) once already (without any lost in SE's referrals or drop in SERPs), and we are going to do it when converting to phpBB3 once more without fear
But, if you want to keep you current urls, it should be doable in most cases too, as HB said, we need to know a little more about your url standard to tell you more precisely how, it's only that converting to phpBB3 could be a good occasion to end up with even more efficient urls. At least, give a try to our SEO Premod
to see what you can do with it, it's installed as fast as phpBB3 and you even have an user-friendly .htaccess generator in acp so ...