Hardware
Intel Pentium 4 processor (1 GHz or faster) with the following:

• 512 MB (or higher) RAM
• At least 20 GB of hard disk space (unless otherwise specified)

Software

• Microsoft Windows Server 2003 R2 or above including 2008 R2 (Standard or Enterprise edition)
• Microsoft Exchange Systems Management Tools for the corresponding version of Microsoft Exchange (2003/2007/2010)
• The following Microsoft Windows components (installed and enabled):
  • IIS 6.0 for Windows Server2003 or IIS 7.0 for Windows Server 2008
  • .NET 3.5 (SP1) framework
  • ASP.NET
  • SMTP
  • NNTP