What operating systems are available or supported on the HP ProDesk 600 G2 SFF?
The HP ProDesk 600 G2 SFF supports Windows 10 Pro 64-bit, Windows 10 Home 64-bit, Windows 8.1 Pro 64-bit, Windows 8.1 64-bit, Windows 7 Professional 64-bit and 32-bit (via downgrade rights from Windows 10 Pro), and FreeDOS 2.0. HP recommends Windows 10 Pro for optimal performance and security. (Page 2)
From the official HP ProDesk 600 G2 Small Form Factor Desktop Computer manual, page 2
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