For details on features and business benefits of Exchange Server 2013, see the product details page.
System Requirements
Install Exchange Server 2013 Using the Setup Wizard
Exchange Server TechCenter
Exchange Server Forums
Read all at http://technet.microsoft.com/en-US/evalcenter/hh973396.aspx?wt.mc_id=TEC_125_1_25
Read my favorites blogs:
Designing a backup less Exchange 2010 Architecture
Step by step guide for upgrading Active Directory from Microsoft Windows 2003 to Microsoft Windows Server 2008
Microsoft Exchange 2010 CAS Array – Steps and Recommendations
Appear Offline in Microsoft Office Communicator Server 2007
Microsoft Exchange 2010 Test cases
Microsoft Exchange Server 2010 Disaster Recovery
Microsoft Exchange Server 2010 Upgrade Guide