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I believe XOOPS would be capable of what we require.
WS-Projects for handling the projects and deadlines, etc
And forums for discussion and docs upload to proof read by the team before final publication.
I don't see why we would all need new E-mail accounts, we have many other ways at our finger tips.
Kind Regards.
Tom
http://bassmanthemes.com
http://www.xoopslance.com