clean

I am in the process of migrating 10,000 mailboxes from 2010 to 2013, our mailbox retention is 30 days.

Now I find myself in the position of needing to recover that old space on the 2010 side.

When I log into the 2010 console and try to review the "Move Request" it pulls it up the give me this error.

I tried it from another console and it showed the last migration but wouldn't let me remove anything.

So, in short, how can I clean this up?

Thanks