If you have a Windows RT tablet such as the Surface RT or are holding off from buying one because it doesn’t come with Outlook… Great news! The upcoming Windows 8.1 Update for Windows RT will also include Outlook 2013 RT.
Currently, Windows RT already ships with Word, Excel, PowerPoint and OneNote but the request to include Outlook was strong enough to get it included in the package now as well.
The Office RT family of applications are exclusive to Windows RT devices (tablets). This version is visually the same when compared with the regular Office 2013 applications but is optimized for the ARM processor, has Touch Mode enabled by default and contains various other battery life increasing and disk space usage reducing changes.