Interesting "co-opetition" case study, since SharePoint includes wiki features as well as pervasive XML syndication (although in neither case with features as extensive as Atlassian or Newsgator)
Atlassian Software Systems Pty. Ltd., one of the top wiki providers, and NewsGator Technologies Inc., a leader in RSS technologies, have joined forces with Microsoft® Office SharePoint® Server 2007, creating additional Web 2.0-based community-building capacity and expanding social computing opportunities in the workplace.
“Social computing and its inclusion in SharePoint Server 2007 are changing the way businesses work and enabling organizations to harness the power of their social networks,” said Derek Burney, general manager of SharePoint at Microsoft Corp. “This has exponentially increased the communication and collaboration among employees, partners, clients and other key stakeholders. Microsoft’s relationships with Atlassian and NewsGator represent dynamic new opportunities for integrating social computing technology into a company’s business productivity infrastructure.”
Microsoft Powers Up Web 2.0 With Innovative Microsoft Office SharePoint Server 2007 Partners: Microsoft Office SharePoint Server 2007 augments enterprise social computing capabilities through NewsGator and Atlassian integration.