Lenovo ThinkPad T61p Hardware Maintenance Manual page 167

Windows Vista Home Premium (32 bit) DVDs
Windows Vista Home Premium (32 bit) is preinstalled as the operating system in
the following models:
v 8889-CTO
v 8890-CTO
v 8891-CTO, 2Sx
v 8892-CTO
v 8893-CTO
v 8894-CTO
v 8895-CTO
v 8896-CTO
v 8897-CTO
v 8898-CTO
v 8899-CTO
v 8900-CTO
v 8938-CTO
v 8939-CTO, 2Lx, 6Vx, 6Yx, 6Zx
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ThinkPad T61 and T61p (14.1-inch)