These systems can support as many as 24 million users. They posses elaborate features not found in smaller products. Another typical characteristic of these giants is an integrated Internet client. There are Java and HTML enabled versions for web access. E-mail features are advanced beyond regular products.
Users have a universal mailbox with mail preferences and signature files.
Users of most cultures can use these products because of their multi-language capabilities. Novell's GroupWise, Microsoft's Exchange, IBM's Lotus Notes and Ventana's GroupSystems are examples of this phenomenal product.