As expected, Outlook can replace the Mail application on Windows RT.
According to Cnet, the reason for the release of Outlook for Windows RT has not been decided yet because internal Microsoft is arguing with each other whether it should launch this email software to the market. However, the source said the rumor about Outlook RT version may be true because users are not really happy with the Mail application available on Windows RT.
If the US software maker decides to release Outlook on Windows RT, there will be two cases. One is that Outlook will replace the Mail application that is being integrated on the operating system, the second is that the software will run in parallel with Mail and users need to download it.