Lenovo, which accounts for 27.6% of the business market, according to IDC, has introduced the ThinkPad T431s, which boasts a more slender look, weighs 24% less than earlier models and eliminates some buttons in favor of expanded touchpad functionality. The redesigned model retains its red tracker button. "We don't change things all that often. We put in a lot of thought into all we did," said Alysia Baker, worldwide product marketing manager at Lenovo. The laptop maker is also prepping a contactless payment capability featuring an embedded near field communication reader.