We have a real estate agency in Sao Paulo, [url=http://www.imobiliariadesaopaulo.com.br] [/url] http://www.imobiliariadesaopaulo.com.br, entirely digital. The site is a wordpress blog and we want to revert to Silverstripe, but we dont want to loose the content. Is that possible? And how the Google will understand this in the organic search?
There is a wordpress connector module - https://github.com/ajshort/silverstripe-wordpressconnector to import the content. Depending on how your wordpress site url's are setup you may be able to keep your URL's, otherwise you'll need to use the link mapping module (https://github.com/ajshort/silverstripe-linkmapping) to map old url's to your new ones.
Also make sure you install the googlesitemap module and submit your new sitemap.xml to Google so that it can reindex your website.