Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.
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Jepp Google Docs can do the basic aproach of this atleast
https://docs.google.com/a/mean.se/previewtemplate?id=0As3tAuweYU9QcHlVM3hrY2tocEkyY3FvbXhoY0NBWFE&mode=public&pli=1
for larger projects I suggest using more advanced colaberation tools but for a small team Google docs will work nicely.