Lenovo 64608VU - ThinkPad T61 6460 Hardware Maintenance Manual page 240

Windows Vista Home Premium (32 bit) DVDs for R61i (some
models)
Windows Vista Home Premium (32 bit) is preinstalled as the operating system in
the following models:
v 7732-CTO, 21x, 23x, 24x, 28x, 2Ax, 6Ax, 6Cx, 6Fx, 6Gx, 6Kx, 8Fx, 8Gx, 8Jx, 8Mx,
9Bx, B3x, BCx, BEx, C3x, C6x, C7x, C8x, CNx, CTx
v 7733-CTO
v 7734-CTO
v 7735-CTO
v 7736-CTO
v 7737-CTO
v 7738-CTO
v 7742-CTO, 21x, 22x, 26x, 9Jx, B5x, B8x, B9x
v 7743-CTO
v 7744-CTO
v 7751-CTO
v 7753-CTO
v 7754-CTO
v 7755-CTO
232
ThinkPad T61, R61, and R61i (14.1-inch widescreen) Hardware Maintenance Manual