The RT version of Surface, which starts at $499, comes with the popular Office programs Word, PowerPoint, Excel and OneNote included. The Pro version does not, according to the specifications listed on a Microsoft website. The cheapest version of Office available is priced at $120.
The RT versions went on sale Oct. 26, the same day Windows 8 was out.
The RT versions are available only at Microsoft's stores and websites. The Redmond, Wash., did not say whether the Pro versions will be sold elsewhere as well.
All versions of Surface come with a slot to expand memory and a USB port for peripherals. The Pro version of Surface comes with a newer, faster USB 3.0 port, while the RT version has 2.0.