title: What Exchange Throttling Policy was tripped?
body: <p>I have a .net app that does a lot of EWS work against an on-prem instance of exchange 2016 using the <a href="https://github.com/OfficeDev/ews-managed-api" rel="nofollow noreferrer">ews-managed-api</a> with impersonation.   A couple mailboxes fail to load all their items using the FindItems method.   I get a ServerBusyException with ErrorCode=ErrorServerBusy and BackOffMilliseconds=2998781(or similar ms).</p>
  
  <p>On the exchange server, I see this corresponding error:</p>
  
  <blockquote>
    <p>Microsoft.Exchange.Data.Directory.SystemConfiguration.OverBudgetException:
    This operation exceeds the throttling budget for policy part
    'LocalTime'  policy value '0'   Budget type: 'Ews'.  Suggested backoff
    time 299781 ms.</p>
  </blockquote>
  
  <p>Here are the relevant policy settings that apply to my impersonation account:</p>
  
  <pre><code>Get-ThrottlingPolicy MyServiceThrottlingPolicy | fl *EWS*
  
  EwsCostThreshold                      : Unlimited
  EwsMaxConcurrency                     : 6000
  EwsMaxBurst                           : Unlimited
  EwsRechargeRate                       : Unlimited
  EwsCutoffBalance                      : Unlimited
  EwsMaxSubscriptions                   : 5000
  </code></pre>
  
  <p>What policy do I need to tweak to adjust my throttling policy to allow my traffic?</p>