title: Outlook API v2.0 getEvents concurrency litmit
body: <p>I am using outlook api v2.0 rest api to perform crud operations against calendars and events and have started hitting a rate limit issue.</p>
  
  <p>This one for example is hitting the <a href="https://docs.microsoft.com/en-us/previous-versions/office/office-365-api/api/version-2.0/calendar-rest-operations#get-events" rel="nofollow noreferrer">calendarview endpoint</a>:</p>
  
  <pre><code>GET https://outlook.office.com/api/v2.0/me/calendars/{CALENDAR_ID}/calendarview
  </code></pre>
  
  <p><strong>RESPONSE HEADERS</strong></p>
  
  <ul>
  <li>Rate-Limit-Limit=10000</li>
  <li>Rate-Limit-Remaining=9982</li>
  <li>Rate-Limit-Reset=2019-10-23T15:27:11.409Z</li>
  <li>Retry-After=1</li>
  <li>RateLimit-Exceeded=MailboxConcurrency</li>
  <li>RateLimit-Scope=Mailbox</li>
  <li>Transfer-Encoding=chunked</li>
  <li>X-Proxy-BackendServerStatus=429</li>
  <li>X-Powered-By=ASP.NET</li>
  <li>X-RUM-Validated=1</li>
  </ul>
  
  <p><strong>RESPONSE BODY</strong></p>
  
  <pre><code>{
      "error": {
          "code": "ApplicationThrottled",
          "message": "Application is over its MailboxConcurrency limit."
      }
  }
  </code></pre>
  
  <p>At first I thought it was the 10.000 requests per 10 minutes period but it seems I am hitting a different one. </p>