Operating System : Microsoft Windows (XP/2003/Vista/2008) or Linux

Java : Java SDK 1.6 from Sun Microsystems

Database : Microsoft SQL Server 2005/2008, Oracle 9i or PostgreSQL 8.1+. PostgreSQL is a free, open source production quality database. Celoxis also works with Express editions of Microsoft SQL Server 2005 or 2008 which are free.

Email Server with SMTP and IMAP4 or POP3