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Opengroupware
An anonymous reader writes: "From the OpenGroupware.org site: the OGo project announces its formation and the release today to the worldwide open source development community of its groupware server software. Gary Frederick, Leader of the OpenOffice.org Groupware Project says: 'Just to be perfectly clear, this is an MS Exchange take-out. OGo is important because it's the missing link in the open source software stack. It's the end of a decade-long effort to map all the key infrastructure and standard desktop applications to free software.' There are also plenty of screenshots of Outlook, Evolution, Korganizer, iCal etc. accessing the server."
Looking at this it looks as though Outlook requires a plugin in order to access the server. However as that plugin is also Open Source, I don't see a major problem with this. The users can't tell the difference.
There is an open source public branch exchange solution already. Supports SIP phones, conferencing, etc.
Check it out. It's stable, easy to work with, and the mailing list is very active.
You are checking your backups, aren't you?
There are two definitions of groupware in the industry. The Microsoft one: groupware consists of email with some additional productivity: Calendar, Mail, and basic forms(which are hardly ever used). And the IBM Lotus one: groupware consists of database forms for routing and document management and email.
Competing with the Outlook definition:
OS foundations Chandler (Calendar focused)
Mozilla Mail (+calendar proj)
Evolution
Open Groupware
kmail/KGroupware
And from the Lotus Perspective:
www.phpgroupware.org
zope
OpenACS
And Lotus Domino which runs on Linux. The client works fine in wine or crossover - but is not officially supported.