Microsoft plans to remove some of the features of Office 2013 RT. The software maker plans to send a version of Office 2013 Preview RT which planted in Windows tablet RT on ARM-based. Later this Preview version will be upgraded to full version in early 2013.
Reasons for not providing full versions of Office 13 and Windows-based RT ARM due to problems with the battery and the stability of the tablet. Macros and VBA will also be 'disposed' of Office 2013 RT. In addition there are some features of 'small' that also removed.
origin source The Verge via teknoup