It can be extended with any of the released Horde applications or the Horde modules that are still in development, like a bookmark manager, or a file manager.

Please see the Horde Groupware Webmail Edition page if you are looking for a groupware suite including webmail support.

Features of Horde Groupware include but are not limited to:

• Dynamic, basic and mobile interfaces
• Public and shared resources (calendars, address books, tasklists and notepads)
• Unlimited resources per user
• Translated into 41 languages including right-to-left scripts and full unicode support
• Global tagging sytem
• Customizable portal screen including applets for weather, quotes, etc.
• Online help system
• Import and export of groupware data from other applications
• Synchronization with PDAs, mobile phones, groupware clients
• Integrated user management, group support and permissions system
• User preferences with global default values
• Strong integration, e.g. address book lookups in meeting planning, task due dates in calendar
• Platform independant, works on any web server with PHP support, i.e. Linux, Windows, Solaris, Mac OS X Server
• Abstract database support, e.g. for MySQL, PostgreSQL, SQLite

Calendar:

• Day, week, work week, month and year views
• Recurring and all-day events
• Alarms with email notifications
• Simple and advanced search forms
• Meeting planning, also with other calendar applications
• Email notification about changed events
• Free/busy information exchange with other calendar applications
• Subscription of remote calendars
• Integration into external clients like Apple Calendar, Mozilla Lightning/Sunbird, Microsoft Outlook
• iCalendar and iTip support

Contacts:

• Distribution lists/email groups, also across address books
• Simple and advanced search forms
• Customizable address book listings
• vCard support
• Address book pager (rolodex)
• Customizable contact fields
• Integration of existing address books
• Integration into external clients through CardDAV

Tasks:

• Priorities and due dates
• Sub-tasks
• Searchable descriptions
• Email notification about changed tasks
• Integration into external clients like Apple iCal, Mozilla Sunbird, Microsoft Outlook
• vTodo support

Notes:

• Fulltext search
• Character counter
• Encrypted notes