This is a carrier-grade Internet mail server with multi-platform support. The software features an array of built-in services, including standards-based SMTP, POP, IMAP and Web mail. It also contains an integrated LDAP directory, a Web server, calendars, scheduling options and a list server. The included SIP Server allows users to communicate.

For over a decade CommuniGate Pro has been known for its robustness and security. The free Community Edition now offers this carrier-grade Internet Communications solution especially for SOHO and small offices with up to five users. CommuniGate Pro is easy to install and maintain and can run on your desktop or laptop.
CommuniGate Pro offer users access to a single source for e-mail, groupware, voice/video and Internet Communications both at the desktop and on the go. CommuniGate Pro is flexible and allows users a choice of access methods and clients - IP phones, soft clients, traditional telephony, mobile devices, browsers and IM agents - all through a single account.
Your FREE 5 user license of CommuniGate Pro - Your one address for all Internet Communications:
* Pronto! an Adobe Flash based client with blazingly fast Internet Communications features
* E-mail through standards-based clients like Thunderbird or Apple Mail
* E-mail and Collaboration through Outlook in Work-group mode
* Groupware features like Calendaring, shared address book etc.
* Webmail with different skins and 15 languages to choose
* Click-to-call from Outlook or Pronto!
* Secure Instant Messaging with clients using SIP/Simple or XMPP (Jabber)
* Mobility with AirSync
* Platform Choice (Unix, OSX, Windows, Linux, BSD)
CommuniGate Systems maintains the highest customer satisfaction level in the industry and has won more awards than any other Internet communications solution. 130 million users rely upon CommuniGate Systems products for their voice and data communication needs.

The license of this software is Free Trial Software, the price is EUR750.00, you can free download and get a free trial.