We've recently decommissioned another Microsoft Exchange 2003 environment for an enterprise client. As part of the final tranche of work, we've also completed their Exchange 2010 deployment, with Database Availability Groups (DAG) to provide high availability for mail and collaboration services. DAG failover has been tested, and as usual, works extremely well.
We've also been busy with one of our SME clients, where we've migrated mailboxes from Exchange 2007 to Office 365, thus moving them from on-premise mail to cloud services. We had to use PSTs as the transport mechanism as RDP over HTTPS wasn’t possible due to an invalid internal domain name that had been used historically. Migration was achieved over a weekend for 70 mailboxes including shared, room and user mailboxes, and the client is very pleased with the result.