Windows 7 Professional edition was designed for small business and professional users, it has all the features of Home Basic and Home Premium editions, and it includes addition features like Encrypting File System, Logical Disk Manager, Offline files, Windows Server Domain join, Windows XP Mode, and more. Compared to Windows 7 Home Premium, Professional Edition has more RAM and CPU support. The 32-bit version of Windows 7 Professional version supports up to 4 GB RAM, while the 64-bit version supports 192 GB RAM, as well as supports up to two physical processors in the system.
Windows 7 Ultimate is the highest in all editions, and was targeted at home PC users. Ultimate and Enterprise editions are almost identical in terms of features, only licensing plans and upgrade options are different. The 32-bit version of Windows 7 Ultimate support up to 4 GB RAM while the 64-bit version supports up to 192 GB RAM. Compared to Home Premium and Professional, the Ultimate version has more features like BitLocker Drive Encryption and Multilingual User Interface. Windows 7 supports a maximum of 1 physical processor in Home Basic and Home Premium Edition, while Ultimate Edition supports 2 physical processor.
