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FAQ: I got error annoying message after login Skype for Business mobile app saying that "We can't connect to the server." What can I do? | OCIO
Skype connection problems: Try these fixes — Auslogics Blog
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Terence Luk: Attempting to share PowerPoint (ppt or pptx) presentations with Skype for Business 2015 fail with: “Some presenting features are unavailable due to server connectivity issues.”
Managing the Connection to Skype for Business Server (Lync)
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