HOW TO: Create a throttling policy for the migration in Exchange on prem

Overview

Ingesting data into an Exchange Server target can lead to performance issues during the ingest relating to the throttling which is built-in to Microsoft Exchange.

Exchange throttles all users and also limits the number of connections that each user can make to Exchange. An Exchange throttling policy need to be created, and applied to the Exchange migration admin user, in order to achieve full migration throughput and avoid connection limit errors.

Solution

• Create throttling policy for Exchange 2010:

New-ThrottlingPolicy EVCThrottlingPolicy
Set-ThrottlingPolicy EVCThrottlingPolicy -RCAMaxConcurrency $null -EWSMaxConcurrency $null -EWSMaxSubscriptions $null -CPAMaxConcurrency $null -MessageRateLimit $null -RecipientRateLimit $null

• Create throttling policy for Exchange 2013 and above:New-ThrottlingPolicy EVCThrottlingPolicy

Set-ThrottlingPolicy EVCThrottlingPolicy -RCAMaxConcurrency Unlimited -RcaMaxBurst Unlimited -RcaRechargeRate Unlimited 
-RcaCutoffBalance Unlimited -EWSMaxConcurrency Unlimited -EWSMaxSubscriptions Unlimited -CPAMaxConcurrency Unlimited 
-EwsCutoffBalance Unlimited -EwsMaxBurst Unlimited -EwsRechargeRate Unlimited -MessageRateLimit Unlimited -RecipientRateLimit Unlimited

Set-Mailbox ExchAdmin -ThrottlingPolicy EVCThrottlingPolicy

NOTE: "ExchAdmin" is the name of your Exchange admin account use for migration.