Here's my issue. Our BESADMIN mailbox is on an E2K3 server so I can't apply the throttling policy to it as outlined in step 4:
4. Type Set-Mailbox "BESAdmin" -ThrottlingPolicy BESPolicy.
Seems very risky to migrate that mailbox to E2010 and have a chance at affecting the other 10K BB users with mailboxes still on E2K3.
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