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