Successful Windows 11 install (and triple-boot) on ThinkPad T400: It was a pain in the ass but I managed to get Windows 11 running smoothly on a ThinkPad T400 from 2008 with
Lenovo/ThinkPad T400 T410 T420S SATA Slim DVD RW Drive Panasonic UJ8C2
Notebook Lenovo ThinkPad T400. Download drivers for Windows XP / Windows 7 / Windows 8 (32/64-bit) – DriversFree.org
Lenovo ThinkPad T400 Series Windows Recovery Restore Boot Disk DVD USB ISO & Drivers
Lenovo Thinkpad T400 Review - YouTube
Lenovo ThinkPad T400 Drivers Download for Windows 7, 8.1, 10
Download Windows 7 (32-bit) drivers for lenovo R61i Laptop (ThinkPad)
Lenovo ThinkPad T400 (Windows 10 & working used and good laptop notebook), Computers & Tech, Laptops & Notebooks on Carousell
lenovo Thinkpad t400 drivers for windows 7,8,10
Lenovo Laptop ThinkPad T400 Notebook - Core 2 Duo 2.40GHz - 4GB DDR3 - 160GB - DVDRW - Windows 7 Pro 64bit - Used - Walmart.com