X Series

The ThinkPad X Series is a line of notebook computers and convertible tablets originally produced by IBM and now marketed by Lenovo.

IBM announced the ThinkPad X Series (initially the X20) in September 2000 with the intention of providing “workers on the move with a better experience in extra-thin and extra-light mobile computing.”The ThinkPad X Series replaced both the 240 and 570 series during IBM's transition from numbered series to letter series during the early 2000s. The first X Series laptops were "slimmer than a deck of cards" and "lighter than a half-gallon of milk", despite the presence of a 12.1-inch Thin-film transistor (TFT LCD) display. These design values – thin and light – continued to be a part of the ThinkPad X Series laptops even after the purchase of IBM’s Personal Computing Division by Lenovo. The first X Series ThinkPad released by Lenovo was the X41 Tablet in 2005.

The ThinkPad X Series laptops from Lenovo were described by Trusted Reviews as combining an ultraportable's weight and form factor with a durable design. The X Series laptops include traditional ultraportables, as well as convertible tablet designs. According to Lenovo, the ThinkPad X Series laptops include low power processors, offer long battery life, and offer several durability features such as a Roll Cage, magnesium alloy covers, and a spill-resistant keyboard.

List of Models (April 2005 and Older)

 * X20
 * X21
 * X22
 * X23
 * X24
 * X30
 * X31
 * X40
 * X32
 * X41