Exchange throttling policy for Exchange Migration

What is Exchange throttling?

Exchange throttling imposes a limit on the number of concurrent call requests that can be executed at the same time.

How to avoid Exchange server throttling?

EdbMails application is designed to migrate the email and other items granularly to avoid throttling issues. In addition, you can create a custom throttling policy with limits higher than the default ones or even disable these limits and assign it to the user account used in the EdbMails application to perform the migration.

Steps to create custom throttling policy in Exchange Management Shell (EMS)

  1. To set the limits higher

    Verify the current throttling

    Command: Copy & Paste it on EMS

    Get-ThrottlingPolicy | fl

  2. Create a new throttling policy:

    Command: Copy & Paste it on EMS


  3. throttling policy settings.

    Use $null or Unlimited values to disable the limits or use custom values

    • Exchange Server 2010:

      Command: Copy & Paste it on EMS

      Set-ThrottlingPolicy NewPolicy -RCAMaxConcurrency $null -EWSMaxConcurrency $null -EWSMaxSubscriptions $null -CPAMaxConcurrency $null

    • Exchange Server 2013 and newer:

      Command: Copy & Paste it on EMS

      Set-ThrottlingPolicy NewPolicy -RCAMaxConcurrency Unlimited -EWSMaxConcurrency Unlimited -EWSMaxSubscriptions Unlimited -CPAMaxConcurrency Unlimited -EwsCutoffBalance Unlimited -EwsMaxBurst Unlimited -EwsRechargeRate Unlimited

    • Assign the admin account used in EdbMails application to the throttling policy

      Command: Copy & Paste it on EMS

      Set-Mailbox "" -ThrottlingPolicy NewPolicy

    • Assigning the throttling policy to all users in your organization

      Command: Copy & Paste it on EMS

      Set-ThrottlingPolicy "NewPolicy" -ThrottlingPolicyScope Organization

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  • Our company has acquired a small division of around hundred employees. After the acquisition, our immediate goal was to migrate Exchange 2010 to Exchange 2016. We have listed few third-party tools to do this Exchange migration job. Our best bet was EdbMails, due to its unique features that supports automatic migration and a simple easy to use user interface :). EdbMails is the only application has passed our re-migration test wherein migration was successful without creating any duplicate items. Holding onto these results we have started our migration project and EdbMails proved to be a worth tool for Exchange migration projects. Of course you save a lot of money and time with EdbMails migration!
     – Drew Richard
    New York, United States

  • One thing that you have the best app for the Exchange. I have tried several other software, but EdbMails is outstanding.
      – Jaime Figueras
    Madrid, Spain

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