To use memory efficiently, Office for Windows RT makes conservative use of temporary information caching, releasing them when the system isn't being actively used.
Since most Windows RT tablets will have Solid State Disk drives, which tend not to offer as much storage space as their counterparts in Intel and AMD-based PCs, Microsoft decided to make some templates and clip art available online, and to delete from the drive language packs that the user doesn't configure for use.
Like Windows RT, the Office version for this OS is also aware when the device is connected to the Internet via a cellular network, and supports generating alerts about issues like data limits and roaming costs.
Juan Carlos Perez covers enterprise communication/collaboration suites, operating systems, browsers and general technology breaking news for The IDG News Service. Follow Juan on Twitter at @JuanCPerezIDG.