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How do I disable the throttling policy on Exchange?

Last Update: 3/23/2017 1:02 PM

How do I disable the throttling policy on Exchange?

 

Answer:

 

Exchange Server has very low throttling policy limits. We recommend disabling the throttling limits during the migration.

Notes:

  • This is only relevant if throttling policies are enabled in the Exchange environment
  • Exchange Server 2007 does not have configuration options for throttling policies, as future versions do. For Exchange 2007's version of ​Client Throttling, see the Microsoft TechNet article https://technet.microsoft.com/en-us/library/cc540454(v=exchg.80).aspx.
  • Exchange 2003 does not have any throttling policies, or any client throttling.
  • When migrating to Office 365, you cannot disable throttling. However, you can make a request to Microsoft Support to have your EWS throttling limits increased for up to 60 days. Refer to KB005493 for details.
  • Refer to KB005004 for more information on whether to use delegation or impersonation. 

 

Option 1: Disable throttling against only the migrating account (if not using impersonation). This way, the admin account can migrate at a faster rate because it is not subjected to any throttling.

Notes:

  • Use this option if not using impersonation during the migration, but instead using delegation.
  • If migrating using admin credentials, it is only necessary to disable throttling against the admin account, rather than all users.
  • If migrating mailboxes using administrative credentials at the Source, but not using impersonation, we recommend disabling throttling limits on this administrative account in order to improve the speed of migration.
  • We recommend the creation of a migration administrative account and disabling policy enforcement for this account.

 

Exchange Server 2010:

To disable all throttling parameters for an admin account called "MigrationWiz":

  1. On a computer that hosts the Microsoft Exchange Management Shell, open the Microsoft Exchange Management Shell.
  2. Type the following command and press Enter:
    New-ThrottlingPolicy MigrationWizPolicy
  3. Type the following command and press Enter:
    Set-ThrottlingPolicy MigrationWizPolicy -RCAMaxConcurrency $null -RCAPercentTimeInAD $null -RCAPercentTimeInCAS $null -RCAPercentTimeInMailboxRPC $null -EWSMaxConcurrency $null -EWSPercentTimeInAD $null -EWSPercentTimeInCAS $null -EWSPercentTimeInMailboxRPC $null -EWSMaxSubscriptions $null -EWSFastSearchTimeoutInSeconds $null -EWSFindCountLimit $null -CPAMaxConcurrency $null -CPAPercentTimeInCAS $null -CPAPercentTimeInMailboxRPC $null -CPUStartPercent $null
  4. Type the following command and press Enter:
    Set-Mailbox "MigrationWiz" -ThrottlingPolicy MigrationWizPolicy

 

 

Exchange Server 2013 or 2016:

To disable all throttling parameters for an admin account called "MigrationWiz":

  1. Open the Exchange Management Shell.
  2. Type the following command and press Enter:

    New-ThrottlingPolicy MigrationWizPolicy

  3. Type the following command and press Enter:

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

  4. Type the following command and press Enter:

    Set-Mailbox "MigrationWiz" -ThrottlingPolicy MigrationWizPolicy

 

Option 2: Disable throttling against all user accounts (if migrating using an admin account and using impersonation). This way the admin account can migrate at a faster rate because it impersonates user accounts, which are not subjected to throttling.

Notes:

  • If migrating mailboxes using administrative credentials at the Source, and using impersonation, disabling throttling limits on all mailboxes will improve the speed of migration, but it is a security risk. The throttling limits are working together to protect an Exchange server from being overwhelmed by accepting and delivering messages.
  • Read carefully through Microsoft Technet article 232205 before you execute the scripts below.

 

Exchange Server 2010:

To disable all throttling parameters for all mailboxes:

  1. On a computer that hosts the Microsoft Exchange Management Shell, open the Microsoft Exchange Management Shell.
  2. Type the following command and press Enter:
    New-ThrottlingPolicy MigrationWizPolicy
  3. Type the following command and press Enter:
    Set-ThrottlingPolicy MigrationWizPolicy -RCAMaxConcurrency $null -RCAPercentTimeInAD $null -RCAPercentTimeInCAS $null -RCAPercentTimeInMailboxRPC $null -EWSMaxConcurrency $null -EWSPercentTimeInAD $null -EWSPercentTimeInCAS $null -EWSPercentTimeInMailboxRPC $null -EWSMaxSubscriptions $null -EWSFastSearchTimeoutInSeconds $null -EWSFindCountLimit $null -CPAMaxConcurrency $null -CPAPercentTimeInCAS $null -CPAPercentTimeInMailboxRPC $null -CPUStartPercent $null
  4. Type the following command and press Enter:
    Get-Mailbox | Set-Mailbox -ThrottlingPolicy MigrationWizPolicy

 

Note: The steps above will remove throttling policies against all user accounts at your Source. You still need to enable impersonation within your MigrationWiz project, so that the admin account can impersonate the user accounts during migrations, and so that the migrations use the bandwidth available to the individual user accounts, rather than just the bandwidth available to the admin account. Follow the directions in KB004727 to enable this.

 

Exchange Server 2013 or 2016:

To disable all throttling parameters for all mailboxes:

  1. Open the Exchange Management Shell.
  2. Type the following command and press Enter:

    New-ThrottlingPolicy MigrationWizPolicy

  3. Type the following command and press Enter:

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

  4. Enter the following command and press Enter:

    Get-Mailbox | Set-Mailbox -ThrottlingPolicy MigrationWizPolicy

     

Note: The steps above will remove throttling policies against all user accounts at your Source. You still need to enable impersonation within your MigrationWiz project, so that the admin account can impersonate the user accounts during migrations, and so that the migratons use the bandwidth available to the individual user accounts, rather than just the bandwidth available to the admin account. Follow the directions in KB004727 to enable this.