xGate is a webmail system.
o Implement as Java Servlet.
o Support IMAP4rev1 and POP3 back-end mail engine.
o Provide mails to PC, mobile-phones and PDA with
  high security method.
o Supported by Orangesoft Inc with low cost management.

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If you can use apache 2.2 and mod_proxy_ajp, add following
lines to httpd.conf:

LoadModule proxy_module libexec/apache22/mod_proxy.so
LoadModule proxy_ajp_module libexec/apache22/mod_proxy_ajp.so
ProxyPass /xgate/ ajp://localhost:8009/xgate/
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WWW: http://www.orangesoft.co.jp/xGate/