I recently upgraded our (still in development) site from 4.2.0 Suite. Our server is operating on Win Server 2008 x64 with IIS 7.0, mySQL 5.1.49 community, and PHP 5.4.3 via FastCGI. As per the Installation/upgrade instructions included in the download I installed to a folder named 'vb5', I also copied the database to a new database called 'username_vb5' with the same user. Installation/upgrade was easy and there were no issues. Upon trying to login to the forums I receive a 404 error in the popup for Login and Signup. I also receive a 403 error when using site.com/vb5/admincp as directory browsing is disabled.
Edit: RESOLVED. In case someone else has this issue I wanted to leave this in case it helps. While I was typing this I decided to grab some screen captures to attach and it was working. All I did was turn on Failed Request Tracing (which has been useless so far), re-check the PHP mappings, re-check the App Pools, re-check all permissions, and restart the website. All I did was check settings, nothing was changed so it just started working on its own after a short time (approximately 45 minutes). I have ISAPI_rewrite installed but am phasing it out in favor of pure IIS configs, perhaps the .htaccess that I deleted after setup confused something at the beginning.
__DEFINE_LIKE_SHARE__