Wordpress + Office 365 login is a Wordpress Plugin that allows Micrsoft O365 users to seamlessly and securely log on to your corporate Wordpress intranet. The plugin will create a Wordpress user for each corporate user when logged on to Office 365 and thus avoiding the default Wordpress login screen: No username or password required.
Using session_start() on each page load causes each page to be loaded from the server and virtually disable caching.