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 operating system (Standard or Enterprise edition). It is recommended that the operating system be freshly installed using default settings.
• Microsoft Exchange 2003 Systems Management Tools Service Pack 2 (SP2) (for Exchange 2003 management)
  or
• Microsoft Exchange 2007 Systems Management Tools (32-Bit) (for Exchange 2007 management)
• The following Microsoft Windows components (installed and enabled):
  • IIS
  • .NET 2.0 framework
  • ASP.NET
  • SMTP
  • NNTP