Greenview Data's Complete Business Email Packages are fully compatible with most corporate infrastructures.
Any email client that supports POP/IMAP/SMTP will work with the Business Edition, and any other standards based groupware application such as Outlook, Thunderbird, Entourage, iCal, etc will work with the features of the Professional Edition.
The webmail interface for the Complete Business Email Packages is based on the Zimbra interface, a feature rich webmail application supporting many of the features you've come to expect from a desktop application including drag-and-drop, context menus and more. The webmail interface also is the portal to the Collaboration Tools, and includes shared folders, calendars, a briefcase for your files and more. The webmail also includes Intuitive Message Management including conversation views, tagging and in line attachment viewing.