Lenovo has refreshed its PC and laptop line-up with new Windows 7 OS. The company has launched a series of Think and Idea brands of PC which will pack the latest OS. Targetted at business users, the 14-inch ThinkPad SL410 and 15.6-inch SL510, both pack Windows 7. Designed for small-to-medium businesses, the laptops offer higher-resolution webcams, clearer microphones, and a microphone mute button for...