title: Lync-SDK MissingMethod-Exception
body: <p>I've trying to update your skype for business-integration. Currently we're using the old sdk which is build with .net 3.5. Now we want to use the new sdk build with .net 4.0. So I've downloaded the actual lync-sdk (which is also for Skype for Business) from <a href="https://www.microsoft.com/en-us/download/details.aspx?id=36824" rel="nofollow noreferrer">https://www.microsoft.com/en-us/download/details.aspx?id=36824</a> and installed it.</p>
  
  <p>After that I've updated the dlls we're using and tried to run our application. Unfortunately it doesn't work. </p>
  
  <p>To find out what the problem with the new lync-dlls is, I've made a small WPF-Application where I reference the new dlls. </p>
  
  <p>At the moment when I call <code>LyncClient client = LyncClient.GetClient();</code> I get the following exception:</p>
  
  <pre><code>System.MissingMethodException: 'Methode nicht gefunden: "Microsoft.Lync.Model.LyncClient Microsoft.Lync.Model.LyncClient.GetClient(Boolean)".'
  </code></pre>
  
  <p>I can see that method in intellisens. I'm a bit confused about this problem.</p>
  
  <p>Anyone has an idea what the problem could be?</p>
  
  <p>I'm working with only Visual Studio 2017 installed on my computer.</p>
  
  <hr>
  
  <p>The problem is within the Microsoft.Lync.Model.dll. If I use the "old" one which runs with .net 3.5 everything just works fine. Using the new dll I get the Exception</p>