While migrating from GroupWise to Exchange 2010 SP1 with Quest GroupWise Migrator for Exchange (GME) I've experienced throughput issues. GME throughput (GB/hour) was decreasing more and more. Event Viewer errors on Exchange Server:
Process Microsoft.Exchange.AddressBook.Service.exe (PID=1636). User 'Sid~XXXXX\name-of-migration-account~RCA~false' has gone over budget '346' times for component 'RCA' within a one minute period. Info: 'Policy:DefaultThrottlingPolicy_4debe28f-3b74-4c7d-83c7-0650cb781f87, Parts:AD:345;'. Threshold value: '100'.
Solution:
1) New-ThrottlingPolicy "Quest GME Throttling Policy" -RCAMaxConcurrency $null -RCAPercentTimeInAD $null -RCAPercentTimeInCAS $null -RCAPercentTimeInMailboxRPC $null
2) Set-Mailbox name-of-migration-account –ThrottlingPolicy "Quest GME Throttling Policy"
3) Restart Microsoft Exchange Throttling service on Exchange Server