I've setup scanning to an SMB share with no problems on Windows 7 with a Fuji Xerox MFD device that's a few years old. Maybe your problem isn't with the file share itself but more with a firewall/security program loaded onto the PC that's blocking either the SMB port (unlikely) or the IP address of the MFD.
I think it's more to do with your customers PC than your MFD device, unfortunately customers don't see it like this.
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