Microsoft has announced the seven different versions of Windows 10 at http://answers.microsoft.com/en-us/insider/wiki/insider_wintp-insider_install/what-are-the-editions-of-windows-10-available/195a4038-c061-4902-bc2b-35922c9d41bc.

The Windows editions are:
· Windows 10 Home – for home PC users
· Windows 10 Pro – additional features like Windows Update for Business
· Windows 10 Enterprise – includes Device Guard for extra security
· Windows 10 Education – for Academic users
· Windows 10 Mobile – for Windows Phone users
· Windows 10 Mobile Enterprise – Windows Phone with Update management for businesses
· Windows 10 IoT Core – ATM and industrial use

A free Microsoft Press e-book – “Introducing Windows 10 for IT Professionals, Preview Edition” is available as a PDF download from http://blogs.msdn.com/b/microsoft_press/archive/2015/05/01/free-ebook-introducing-windows-10-for-it-professionals-preview-edition.aspx, which documents the April 2015 Windows 10 Technical Preview version. Further updates will be done on the e-book as Microsoft makes further changes to the upcoming Windows 10 versions.