[2][3] The S series began with the IdeaPad S10, the lowest cost model, powered by an Intel Atom processor in a 10.2-inch subnotebook.

The S10 supported IEEE 802.11 b/g wireless networking and had two USB ports, an ExpressCard expansion slot, a 4-in-1 media reader, and a VGA output.

While the S10-2 shared many traits with the S10/S10e,[7] it omitted the ExpressCard34 slot, featured a new physical design, added an additional USB port, and enlarged the keyboard, touchpad,[8] and sizes of the hard drive and SSD.

[10] The netbook offered a wide keyboard occupying almost the entire width of the chassis, and LAPTOP Magazine reported that it was easy for even adults to type on.

[14] Its features that were well-received included the 12 inch widescreen with a 1280×800 resolution, keyboard, express card slot, and battery life.

[16] Michael Prospero from LAPTOP Magazine indicated in his review that Lenovo had addressed some of the issues raised about the S10-2 netbook and praised the keyboard and the design.

The S205 had an AMD Fusion E350 dual core processor, 11.6" widescreen display with a 16:9 aspect ratio, and ATI Mobility Radeon 6310M graphics.