Accessing a SMB share without a password

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http://stackoverflow.com – When accessing SMB shared that are password-protected, smbclient works just fine. But when I'm trying to access shared that have no password protection (public shares), smbclient prints: tree connect failed: NT_STATUS_ACCESS_DENIED How can I access those shares? I'm trying to access Windows 7 from my Ubuntu 12.10 (HowTos)