title: What is the simplest EWS call to test connectivity?
body: <p>Among all the <a href="http://msdn.microsoft.com/en-us/library/exchange/bb409286%28v=exchg.140%29.aspx" rel="nofollow">Exchange Web Services Operations</a> I'm looking for the simplest one I can initially use to check if my connectivity to the EWS endpoint works.<br />
  The low-level code I use to build and execute SOAP calls expects valid results so whatever operation I use should not return with an error message.</p>
  
  <p>I have considered several but don't find them satisfactory:</p>
  
  <ul>
  <li><p><a href="http://msdn.microsoft.com/en-us/library/exchange/dd899430%28v=exchg.140%29.aspx" rel="nofollow">GetServerTimeZones</a> is only supported from Exchange 2010, and I need 2007+</p></li>
  <li><p><a href="http://msdn.microsoft.com/en-us/library/exchange/aa563518%28v=exchg.140%29.aspx" rel="nofollow">ResolveNames</a> needs a (partial) user name, but I want it do to be user independent. Also, it could return errors (not match) or maybe hundreds of matches (match with 'e').</p></li>
  <li><p><a href="http://msdn.microsoft.com/en-us/library/exchange/dd899439%28v=exchg.140%29.aspx" rel="nofollow">GetUserConfiguration</a> works for the currently logged in user, but is only supported from 2010.</p></li>
  </ul>
  
  <p>Any other ideas?</p>