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Regardless of what operating system your current client computers are running, there’s a high likelihood that they will work with SBS 2011 Essentials.
SBS 2011 Essentials supports client computers running Windows XP (Service Pack 3), Windows Vista, and Windows 7. It even supports Home editions of Windows, though there are some limitations on the functionality of Home editions. SBS 2011 Essentials supports clients running both 32-bit and 64-bit versions of Windows, with the exception of Windows XP Professional, x64 Edition. Finally, SBS 2011 Essentials supports Mac clients running at least OS/X 10.5 (Leopard).