GroupOffice - enterprise CRM and groupware tool

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Take your office online with GroupOffice groupware. and CRM Share projects, calendars, files and e-mail online with co-workers and clients. Easy to use and fully customizable, GroupOffice takes online collaboration to the next level.

Features
E-mail client
CRM
Calendar and tasks
Projects
Synchronization
Frontend for the postfix mailserver
Notes

A box for this open source CRM: www.group-office.com