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https://answers.microsoft.com/en-us/msoffice/forum/all/skype-for-business-not-able-to-login/bf47c981-990c-462d-b84c-24dd2ed75210
https://social.technet.microsoft.com/Forums/exchange/en-US/8dd742e2-9b29-4e51-87e6-6acfb40f83e3/sign-in-problem-with-a-particular-user?forum=lyncprofile
https://community.spiceworks.com/topic/1108231-skype-for-business-unable-to-sign-in
https://www.win-10-forum.de/office/79734-skype-for-business-dns-problem.html
https://www.experts-exchange.com/questions/28312243/Office-365-Lync-2013-issue.html
http://conferencing683.rssing.com/chan-26031171/all_p28.html
http://using1854.rssing.com/chan-58333197/latest.php
http://www.winfuture-forum.de/index.php?showtopic=112270
https://www.syedshah.org/cant-sign-in-to-skype-for-business-the-user-name-password-or-domain-seems-to-be-incorrect/
http://forum.oszone.net/thread-310743.html
https://it.cornell.edu/skype-win/skype-business-windows-problem-server-temporarily-unavailable
https://tsoorad.blogspot.com/2012/10/lync-2013-client-login-using.html