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Changes to the Windows codebase were made to optimize the OS for the internal hardware of ARM devices, but a number of technical standards traditionally used by x86 systems are also used.Wo A devices would use UEFI firmware, and have a software-based Trusted Platform Module to support device encryption and UEFI Secure Boot.' It just isn't capable of doing that by design." As the version of Office RT included on Windows RT devices is based on the Home & Student version, it cannot be used for "commercial, nonprofit, or revenue-generating activities" unless the organization has a volume license for Office 2013, or the user has an Office 365 subscription with commercial use rights.Due to the different architecture of ARM-based devices compared to x86 devices, Windows RT has software compatibility limitations.Sinofsky felt that the shift towards So C designs were "a natural evolution of hardware that's applicable to a wide range of form factors, not just to slates", while Microsoft CEO Steve Ballmer emphasized the importance of supporting So Cs on Windows by proclaiming that the operating system would "be everywhere on every kind of device without compromise." Initial development on Wo A took place by porting code from Windows 7; Windows Mobile smartphones were used to test early builds of Wo A because of lack of readily available ARM-based tablets.Later testing was performed using a custom-designed array of rack-mounted ARM-based systems.
Unlike Windows 8, Windows RT is only available as preloaded software on devices specifically designed for the operating system by original equipment manufacturers (OEMs).
However, while Windows RT inherits the appearance and functionality of Windows 8, it has a number of limitations; it can only execute software that is digitally signed by Microsoft (which includes pre-loaded software and Windows Store apps), and it lacks certain developer-oriented features.
Windows RT was released to mixed reviews from various outlets and critics.
Some felt that Windows RT devices had advantages over other mobile platforms (such as i OS or Android) because of its bundled software and the ability to use a wider variety of USB peripherals and accessories, but the platform was criticized for its poor software ecosystem, citing the early state of Windows Store and its incompatibility with existing Windows software, and other limitations over Windows 8.
Critics and analysts deemed Windows RT to be commercially unsuccessful, citing these limitations, its unclear, uncompetitive position of sitting as an underpowered system between Windows Phone and Windows 8, and the introduction of Windows 8 devices with battery life and functionality that met or exceeded that of Windows RT devices.
Subsequently, Microsoft announced that it would also support the desktop version of Windows 10 on ARM architecture devices (particularly laptops), with emulation of the IA-32 architecture to enable compatibility with existing software.