Best way to keep your forum listing when changing

[Black Tiger]

I had vbulletin running before. It was at my /public_html/board directory and search results in Google are pretty nice. Also due to a sitemap creator I had working.
However, I had a portal running, so for adsense and Google, my forum domain was pointing to the root directory (public_html).

Now I migrated to SMF and my forums are in /public_html/forum but Google was complaining about crawl errors ofcourse.

What can i do best now to keep my nice results?

Redirect to /forum? Or just have my simpleportal put up the stand alone version so I have a portal page again in my root folder, so I don't need to change my site url to /forum and keep things the way it is?

I'm now sure what's best, any clues on that?

[Black Tiger]

Since nobody seems to have a good advise on this SEO wise... I decided to keep it as it was, so with portal so a redirect was not needed.

[Kindred]

Sorry for not responding earlier..., but there is no good way to do it
Changing software and changing directories will cause google issues... On the other hand, if it was crawled, Google should soon recrawl and reindex.

You can add an smf site map to help

[Black Tiger]

Yep I will do that sitemap anyway, had it before too... just fixing the last things with my forum. Thanks!