UR22 mkII Compatibility Check

According to the Steinberg site the UR22 mkII only works with Mac OSX 10.7 and above, but I am wondering whether this is a loose system requirement, as it is unclear whether the requirement refers to the drivers/firmware of the device or (only) to a newer version of Cubase AI and Cubasis, neither of which I need. I am using Mac OSX 10.6.8.

Can anyone say whether the interface MUST be used with Mac OSX 10.7 and above, or is there leeway?

Thank you.

I apologize for the bump, but would anyone know the answer? I will have to return the audio interface soon depending on what that answer is.