Lenovo 6457 - ThinkPad T61 - Core 2 Duo 2.5 GHz Hardware Maintenance Manual page 174

Windows Vista Home Premium (32 bit) DVDs
Windows Vista Home Premium (32 bit) is preinstalled as the operating system in
the following models:
v 6457-CTO, 6Hx, 6Kx
v 6458-CTO
v 6459-CTO, 4Mx, 8Ex, C8x, DKx
v 6460-CTO
v 6461-CTO
v 6462-CTO
v 6463-CTO
v 6464-CTO
v 6465-CTO, 9Qx
v 6466-CTO
v 6467-CTO
v 6468-CTO
v 6470-CTO, 4Gx, 7Nx, B4x
v 6471-CTO
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ThinkPad T61 and T61p (15.4-inch widescreen) Hardware Maintenance Manual