RoundCube Webmail是一个基于浏览器，支持多国语言的IMAP客户端，操作界面看起像一个桌面应用程序。它提供一个e-mail客户端应该具备的所有功能包括 MIME支持,地址薄，文件夹操作，信息搜索和拼写检查。RoundCube Webmail采用PHP+Ajax开发并且需要MySQL数据库来存储数据。 用户界面采用XHTML+CSS2设计。
特性：
支持超过 70 中语言
Drag-&-drop message management
Full support for MIME and HTML messages
Sophisticated privacy protection
Compose messages with attachments
Multiple sender identities
Full featured address book with groups and LDAP connectors
Find-as-you-type address book integration
Richtext/HTML message composing
Forwarding messages with attachments
Searching messages and contacts
Threaded message listing
IDNA support
Spell checking
Canned response templates
IMAP folder management
Shared/global IMAP folders
Support for external SMTP server
Support for access control lists (ACL)
Built-in caching for fast mailbox access
Unlimited users and messages
Import/export functions
Template system for custom skins
Plug-in API for flexible exensions
服务器要求：
Apache, Lighttpd, Nginx, Cherokee or Hiawatha web server
PHP Version 5.2.1 or greater
MySQL, PostgreSQL, SQLite or MSSQL database
An IMAP server which supports IMAP4 rev1
An SMTP server (recommended) or PHP configured for mail delivery
