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This one should be easy to get rocking on Windows RT since Microsoft is in the driver's seat.
Skype is the standard for voice chats and could turn Windows RT tablets into mobile workstations.
Windows RT will have Office onboard, but Microsoft should rely totally on Skydrive cloud support.
Millions of mobile users are entrenched in the Evernote cloud system, and a native Metro Evernote apps would be a big draw.
Tablets are good media consumption devices and the Kindle ecosystem is the biggest of them all.
Having a native Kindle app would greatly increase the usefulness of Windows RT tablets for buyers.