Disabling theThrottling Policy

Applies to: User Mailbox

On Microsoft Exchange, throttling is enabled by default . To improve the performance of your Exchange mailbox backup and to remove connection bandwidth limits, disable the Exchange throttling policy for the service account.

How you set the throttling policy depends on what Exchange version you use.


  1. On each Exchange server with a Client Access Server (CAS) role:
    1. In Exchange Management Shell, run the following command:

      Set-OutlookAnywhere –identity "<Exchange Client Access Server name>\rpc (Default Web Site)" -InternalClientAuthenticationMethod ntlm

    2. In Windows, open the Command Prompt window, and then run IISRESET.
  2. In Windows, on the taskbar, click Start, and then click All Programs > Microsoft Exchange Server version_number.
  3. Click Exchange Management Shell.
  4. Run the following cmdlets based on the version of Exchange Server that you use:
    • Exchange 2013 or later:

      New-ThrottlingPolicy CVThrottlingPolicy

      Set-ThrottlingPolicy CVThrottlingPolicy -RCAMaxConcurrency unlimited -RcaMaxBurst unlimited -RcaRechargeRate unlimited -RcaCutoffBalance unlimited -PsWsMaxConcurrency unlimited –IsServiceAccount:$true

      Set-Mailbox <service account> -ThrottlingPolicy CVThrottlingPolicy

    • Exchange 2010:

      New-ThrottlingPolicy –name CVThrottlingPolicy

      Set-ThrottlingPolicy –identity CVThrottlingPolicy –RCAMaxConcurrency $null –RCAPercentTimeInAD $null –RCAPercentTimeInCAS $null –RCAPercentTimeInMailboxRPC $null -PowerShellMaxConcurrency $null

      Set-Mailbox –Identity <service account> –ThrottlingPolicy CVThrottlingPolicy


      service account is the Exchange Administrator Service Account.

  5. For the throttling policy to take effect immediately, restart the Exchange RPC service.

Last modified: 11/13/2020 3:46:29 PM