Softalk Share Server provides native support for folder sharing in Microsoft Outlook. It shares folders in a very similar way to Exchange Server. There is no synchronization involved. This means that changes you make in Outlook can be seen instantly
MailDisclaimer for Exchange Server provides comprehensive functionality for adding disclaimers for users or groups of users in organizations that use Exchange Server 2000/2003.
WorkgroupMail is a full featured mail server, which can provide any size organization with secure and dependable messaging.
Lets you share Outlook information, such as contacts and calendars, without needing Microsoft Exchange. Provides full administrative control over user access rights, through its comprehensive administrator program.