Exchange Server Throttling Policy

Exchange Throttling Policy

Steps to create custom Exchange server throttling policy

Exchange throttling policy for Exchange Migration

What is Exchange throttling?

On-premise Exchange server uses throttling policies to ensure that a single user does not use up all the Exchange server resources. Normally, this ensures that the Exchange server remains healthy and available for all the users. However, during migration, if you migrate more mailboxes at a time, the Exchange server will throttle, and you will encounter performance issues. Exchange throttling imposes a limit on the number of concurrent call requests that you can execute at the same time. Therefore, it is advisable to create a new "migration" throttling policy in order to achieve error free migration.

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)

To set the limits higher
Verify the current throttling
Command: Copy & Paste it on EMS
Get-ThrottlingPolicy | fl
Create a new throttling policy:
Command: Copy & Paste it on EMS
New-ThrottlingPolicy
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 <mailbox name= " "> -ThrottlingPolicy NewPolicy
Assigning the throttling policy to all users in your organization
Command: Copy & Paste it on EMS
Set-ThrottlingPolicy "NewPolicy" -ThrottlingPolicyScope Organization

Exchange Throttling Policy

Steps to create custom Exchange server throttling policy

User Manual

Exchange throttling policy for Exchange Migration

What is Exchange throttling?

How to avoid Exchange server throttling?

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