Microsoft ships its high-end tablet with Windows 8.1 Pro. Dell puts either Windows 8.1 or Win 8.1 Pro inside. The major differences between Windows 8.1 versions will matter most to people using the device on a corporate Windows network. The Pro edition includes BitLocker for file security and can join domains, process Group Policies, become a Hyper-V client, boot from virtual images and host Remote Desktop sessions. Of course, core Windows functions exist on both, including a Desktop mode with support for multiple windows, the ability to run multiple instances of the same application and to run legacy x86 apps. Neither Windows 8.1 nor the Pro version can create Windows To Go sessions; that's a feature reserved for Windows 8.1 Enterprise.