無法登入 Skype for Business (couldn’t find a Skype for Business Server)
sipdir.online.lync.com:443
Skype for Business won’t sign in – Microsoft Community
Office 365: Skype for Business DNS issue | Fazar
https://fazarsusanto.wordpress.com/2015/11/01/office-365-skype-for-business-dns-issue/
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