Microsoft Exchange Links for documentation
Microsoft Exchange 2003
Microsoft Exchange 2007
Microsoft Exchange 2010
Exchange Server 2010 Database Availability Group Installation Step by Step
Exchange 2010 on VMware – Availability and Recovery Options
Exchange Server 2010 Mailbox Server Backup and Recovery
Logging SMTP Protocol Activity in Exchange 2010 and Exchange 2007
SMTP Routing in Exchange 2010
Microsoft Exchange 2013
Exchange 2013 System Requirements
Microsoft Exchange Blogs
http://www.exchange-genie.com/2009/04/database-availability-group-dag-exchange-2010/