"The Messaging app needs updates, too," said a commenter identified as Leo Preuss Jr.
Microsoft, however, did not mention Messaging, its instant message and chat app, fueling speculation that the company has plans to kill the program and instead push people to Skype.
But one analyst simply shrugged off today's news.
"The speed with which they update [core] apps from the [Windows] Store, that's not that big an issue, because for me, their functionality is so poor that no one is using them in volume," Michael Cherry of Directions on Microsoft, said in an interview.
"The functionality is so poor that I don't care if they release updates," Cherry continued, noting that he gave up on all three on his Windows 8 and Windows RT devices.
Windows 8 users can run alternate software on the Windows 7-esque "classic" desktop -- including Office and its Outlook email and scheduling application -- but that's not possible on Windows RT, which is stuck with the Windows Store apps. Even Office 2013 RT, included on each Windows RT tablet, isn't a solution, since it lacks Outlook.
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