title: Trying to use EWS in Android App. Could not load Assembly 'System.Directory' Services
body: <p>I want to create an Android App and get a list of rooms from our Exchange2010 Server. For that wanted to use EWS(Exchange Web Services). I tried installing the newest Version(2.2.0) of EWS through NuGet, but it fails with:</p>
  
  <blockquote>
    <p>Could not install package 'Microsoft.Exchange.WebServices 2.2.0'. You are trying to install this package into a project that targets 'MonoAndroid,Version=v5.1', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.</p>
  </blockquote>
  
  <p>Since I wasn't able to resolve this issue, I tried the outdated Version of EWS(1.2.0), which I was able to install. I made some basic code for testing and when trying to Build I get the Error:</p>
  
  <blockquote>
    <p>Could not load assembly 'System.DirectoryServices, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. Perhaps it doesn't exist in the Mono for Android profile?</p>
  </blockquote>
  
  <p>After that, I added a reference to System.DirectoryServices.dll. Now I can Build the App. When trying to debug though, the App pops up in the Emulator and closes again, then I get the Error:</p>
  
  <blockquote>
    <p>Could not load assembly 'System.DirectoryServices' during startup registration.</p>
  </blockquote>
  
  <p>I am using Visual Stuido Enterprise 2017 on Windows 10(latest Update).
  Does Anyone have an ide what i can do to make this work? I also tried different Android Version as Target Platform, but none worked.</p>