Note The first incoming instant message in a toast notification can be read by screen readers.
Resolution
To resolve this issue, install the June 9, 2015 update (KB3054791) for Microsoft Lync 2013 (Microsoft Skype for Business).
Note
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After you install this update, Microsoft Narrator will also read a user's name when the user sends you an instant message in an existing conversation.
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Lync 2013 was upgraded to Skype for Business in April 2015.
