Collaborative Thinking: 2009: Planning Considerations For Enterprise 2.0 - 0 views
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Jive: Perhaps the most successful "mini suite" in the market right now and a good option for organizations that don't want to commit to SharePoint and have reservations about IBM.
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Telligent: Telligent could be the "Jive of 2009" given its latest release (which rounds out the features), its integration with SharePoint, and alignment with a Microsoft environment overall.