Models: MXM753N, MXM753U, MXM623N, MXM623U, MXM283N, MXM363N, MXM453N, MXM503N, MXM363U, MXM453U, MXM503U, MXB401, MXB402, MXB402SC Operating Systems(s): Windows 7 x86/x64 Windows Server 2008 x86/x64 Windows Vista x86/x64 Windows Server 2003 x86/x64 Windows XP x86 / x64 Windows 2000 PCFAX driver version: 3.6.6.4 Note: Both fax and printer expansion kits are required Version information may be verified in the Log Viewer application by clicking Help > About