SmarterMail Professional edition has all of the features required to host a fully-functional mail server. The Enterprise edition offers additional features, including:

• Microsoft Exchange ActiveSync add-on
• Advanced Collaboration - Shared calendars, contacts, tasks, and notes
• LDAP Support
• Global Address List (GAL)
• Message Prioritization and Throttling
• Active Directory Authentication
• Message Archiving
• Over-the-Air synchronization for BlackBerry, iPhone, and Windows Mobile
• Two-way Synchronization for Microsoft Outlook
• Mailing list management functions
• Custom and Emailed reports