One of the key improvements granted by the ASP.NET integration in IIS 7.0 is a unified authentication model.  Instead of the two-stage model in previous versions of IIS, where IIS executed its own authentication methods before ASP.NET processing began, in Integrated mode IIS and ASP.NET authentication modules participate in a single authentication process as equals. … Continue reading IIS 7.0 Two-Level Authentication with Forms Authentication and Windows Authentication