Moving mailbox: {0} ({1}) to database: {2}. This can take a long time and the mailbox won't be accessible until the move ...

Moving mailbox: {0} ({1}) to database: {2}. This can take a long time and the mailbox won't be accessible until the move is complete. You're moving this mailbox to an earlier version of Exchange, which will result in the loss of some features and data available only in Exchange 2010.