Microsoft is informing Skype users on Windows Phone 8/8.1, Windows RT, the Messaging app on Windows 10 Mobile, and Skype for TV, that they "will no longer be able to sign in" to Skype from July 1.
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Microsoft says that it will end support for Skype for TV in June, with no further updates or improvements, and warns that some manufacturers may remove the app "from some or all of their models".