MailBee WebMail Pro PHP is advanced but easy-to-install web-based email and calendar client with modern AJAX interface. It's built as a set of PHP scripts (with source code, modification allowed). Users can receive, view, manage, and send email through web interface. Supports POP3, IMAP, SMTP, calendar, address book, folders, rich-text editor, skins, non-English languages, web-based admin panel. Can use MS SQL or MySQL database.