Microsoft just announced the Surface Go, an entry-level model in its tablet/laptop combo line.

The bottom line: At $399, it is the company's cheapest model yet, and one that Microsoft hopes will take it further into the important education market.

The details: Surface Go is powered by an Intel processor, has a 10-inch screen and, at 1.15 pounds and 8.3 mm thin, it's also the smallest and lightest member of the Surface family. A Wi-Fi version goes on sale Aug. 2, with pre-orders starting now. An LTE-equipped version is planned for later in the year.