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OS: Windows 98/ME/NT 4.0/2000/XP/2003
CPU: 333MHz or greater
RAM: 128MB or greater
Disk space: 100MB or greater
Domain name and DNS service for domain ('MX' records are optional).
External machines must be able to access ports 25 (SMTP), 110 (POP3), 143 (IMAP4), and/or 389 (LDAP).