n-Tiered, Modular Design.
The IIS-OS design implements true separation of concerns and Model View Controller design by completely separating the Presentation Tier, Middle Tier and Database Tier of the application and ensuring that only the appropriate processes are implemented within each tier. The IIS-OS utilizes industry standard web services for module interactions and system-to-system interactions.
Modern programming frameworks.
As a newly developed system, IIS-OS utilizes programming frameworks (such as Hibernate, Spring, etc.) that did not exist at the time when many other IIS systems in the market were built. These programming frameworks are much more sophisticated, powerful and easier to use than their predecessors.
The IIS-OS is platform independent and does not require expensive proprietary platform tools to function. It is built using Java (rather than Microsoft .NET), so avoids always being locked into using and paying for the Microsoft tool set and server platforms.
Designed with the entire end goal in mind.
The IIS-OS was designed from the ground up with the full scope of the project in mind, so the architecture is one that was planned knowing the full breadth of the toolset and functionality in mind. Other IIS systems in the market were started over a decade ago, so include very old code and utilize a patchwork of software languages and design patterns, some of which are antiquated. Often companies will refactor legacy code over time; in the IIS market however, the incentive to do so often does not exist. These systems may meet the functional needs, but the maintenance, flexibility and scalability are not nearly as efficient as IIS-OS.