title: (MS Exchange) Mailbox database is temporary unavailable
body: <p>I am trying to send mail using Exchange web service api.I am using autodiscover in order to retrieve the client profile.When I am trying send mail I am getting this error:</p>
  
  <pre><code>  Microsoft.Exchange.WebServices.Data.ServiceResponseException: 
    The mailbox database is temporarily unavailable.
  </code></pre>
  
  <p>Any tips on how to resolve this would be greatly appreciated.</p>