@Mail is a commercial webmail, mail-server and groupware solution designed by Calacode, located in Sydney, Australia. The software is designed for Unix and Linux systems as an alternative to Microsoft solutions. @Mail supports over 13 million active users. The software includes the source-code under a commercial license.
@Mail Server - leverages existing open source projects such as Courier-IMAP, Exim and MySQL to provide a complete mail-server solution with the base design for ease of management via a Webadmin control panel.
@Mail Groupware - provides a groupware server for users to share Calendar, Task and Contacts via Outlook clients and a Web-interface. A MAPI Sync Utility is available for Microsoft Outlook, allowing clients to sync address-book, calendar & task data from the @Mail server. This creates an alternative to Exchange under a Linux platform.
As of 19th May 2008 a free version of the @Mail webmail client was made available. Named AtMail Open it is a lightweight version of the commercial application and is distributed under the Apache 2.0 license.