If you recently typed a conversation in Microsoft Lync, you may receive a message in the Lync conversation window that the message may not have been sent to the Lync recipient.
This message may not have been to “” because the server timed out.
The error may occur if your Lync client’s cache needs to be cleared. Try to clear the Lync cache following the steps below.
C:\Users\Username\Appdata\Local\Microsoft\Office\15.0\Lync\
C:\Users\Username\Appdata\Local\Microsoft\Office\15.0\Lync\Tracing
HKEY_CURRENT_USER\Software\Microsoft\office\15.0\Lync
Re-open Lync. Begin a new conversation in Lync with the same person you were having the message may not have been sent to error. See if your issue is now resolved.
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