Unlimited TotalItemSize during 2007 to 2010 mailbox moves

Neat. While a mailbox is moving, the TotalItemSize it unlimited!

This was odd to see while trying to figure out the progress of a move. I suppose if this was a spambox accepting thousands of messages, this could be a true statement, but odd to see it when the finite size could be calculated.

A better way to check move progress is to filter on Mailbox Replication -> Mailbox Move in your application event log.