The diagram comes after the previous Exchange 2010 Transport Architecture diagram and is similar in nature to the Exchange 2007 version of the diagram, and split into the following sections:

• Management and Monitoring
• High Level Architecture
• Edge Transport Server Role
• Hub Transport Server Role
• High Availability
• Client Access Server Role
• Mailbox Server Role
• Unified Messaging Server Role

Head over to the Microsoft Download Center now to download.

In Exchange 2010, we now have the option to allow mailboxes to be automatically distributed across databases. However, the algorithm used simply randomly allocates the new mailbox to our chosen databases - rather than ensuring the mailbox count is balanced, and doesn't do anything about re-distributing mailboxes if you add new databases.

To help with this, and of course to help with any situation where you want to balance the number of mailboxes across a set of databases, Steve Goodman has written a simple script that help with moving mailboxes to balance out your databases.