I’ve encountered a problem when moving a WordPress installation from a Linux Apache server to a Windows IIS server. Nearly all pages load blank, including /wp-admin/. I created a php file in the main directory to check phpinfo, and it loads fine.
I’ve copied the file system over, as well as the database. I’ve also updated the wp-config.php with the correct credentials.
I think it has something to do with .htaccess, but I’m not sure how to correct it. Any help would be greatly appreciated.
.htaccess is not used on Windows IIS servers.
http://learn.iis.net/page.aspx/557/translate-htaccess-content-to-iis-webconfig/
Sounds like you have a permalink problem, compounded by the fact that permalinks operate differently on IIS than Linux. See: Using Permalinks « WordPress Codex
Try resetting permalinks to default in Dashbord/Settings/Permalinks, if you can get into Admin. If not, you need to go into the database with phpmyadminand manually clear the permalink field in wp_options, usually around option 34.
Update: And, did you change domains? Or just hosting? See this, too: Moving WordPress « WordPress Codex