Arbitration (System mailbox) - is really big

We are doing a 2010 to 2013 migration, and when moving our arbitration mailboxes I noticed one of them has over 1,000,000 items in it, and it's been moving for 7 hours and counting. Is this normal? Why does this one particular mailbox have so many items
in it? It has the ArbitrationRetention policy applied like it should. How can I reduce the size of this mailbox? It's only of one of them with the problem, one of the SystemMailboxes. All the others are very small and moved quickly.

Hi,
First, please check if this arbitration mailbox has a retention policy assigned using the following command.
Get-Mailbox -Arbitration | fl name,retentionpolicy
If you want to delete items manually, you can use MFCMapi to connect to the arbitration mailbox to remove them.
Here is a related blog for your reference.
Using MFCMapi to connect to the Exchange System Attendant Mailbox / Arbitration Mailbox
http://blogs.technet.com/b/ehlro/archive/2010/11/01/using-mfcmapi-to-connect-to-the-exchange-system-attendant-mailbox.aspx
Best regards,
Belinda
Belinda Ma
TechNet Community Support

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Welcome to Microsoft Exchange Server 2013 Cumulative Update 7 Unattended Setup
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