Diagnostic Logging Management is back in Exchange Server 2010. A new wizard based UI now enables administrators to quickly Exchange server-related logging and logging levels. This will assist in easy instrumenting of your Exchange servers for diagnostics. The following screenshot shows the new wizard. The new wizard also makes it simple to reset all event logging levels to the default setting when diagnostics are complete to ensure optimal server performance. In Exchange Server 2010, administrators will now be able to configure and manage Outlook Web App (OWA) Mailbox feature policies completely within the EMC. Once these policies have been created (with quite a granular detail of control), they can then be assigned to mailboxes (individually or in bulk) within the organization. The following screenshots demonstrate this new feature.
Full Article: Exchange blog