Lenovo ThinkPad T61 Hardware Maintenance Manual page 242

Windows Vista Business (32 bit) DVDs for R61i (some models)
Windows Vista Business (32 bit) is preinstalled as the operating system in the
following models:
v 7732-CTO, 22x, 29x, 2Bx, 6Bx, 6Ex, 6Hx, 8Bx, 8Dx, 8Ex, 8Hx, 8Kx, 8Lx, 8Nx, 8Zx,
B1x, B2x, B4x, B5x, B7x, BAx, BBx, BDx
v 7733-CTO
v 7734-CTO
v 7735-CTO
v 7736-CTO
v 7737-CTO
v 7738-CTO
v 7742-CTO, 23x, 29x, B1x, B2x, B4x, B7x
v 7743-CTO
v 7744-CTO
v 7751-CTO
v 7753-CTO
v 7754-CTO
v 7755-CTO
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ThinkPad T61, R61, and R61i (14.1-inch widescreen) Hardware Maintenance Manual