The first X Series laptops were “slimmer than a deck of cards” and “lighter than a half-gallon of milk”, despite the presence lenovo thinkpad x1 carbon sim card slot a 12. The X Series laptops include traditional ultraportables, as well as convertible tablet designs. Processor: Intel mobile Pentium M processor 1.
X21, X22, X23, X24, X30, and X31. The X41 Tablet was convertible, with the capacity to function as a tablet PC and an ultraportable laptop. The X32 was introduced in 2005.