The standard is released by the companies Oracle, IBM, Microsoft, Open Text, SAP and Alfresco and makes it possible to open a SharePoint document library in another CMIS compliant system or vice versa. Microsoft’s says it enables SharePoint users to interact with content stored in any repository that has implemented the CMIS standard, as well as making SharePoint 2010 content available to any application that has implemented the CMIS standard.
What does Microsoft offer in addition to the standard
Microsoft provides a Consumer Web Part, which can be added to any SharePoint page and displays and lets users interact with the contents of any CMIS repository plus a Producer, which allows applications to interact with SharePoint lists and document libraries programmatically by means of the interfaces defined in the CMIS standard. The producer creates a set of web services that can be used by CMIS compliant clients. After you download and run the executable, then it is a matter of activating the features like any other SharePoint feature after you select a site where the document libraries will be used as document repositories. Every document library in this site will be available as repository through the CMIS connector. The CMIS consumer web part can be added to a SharePoint site on port 80 only. Once added you fill in Web Part properties like any other web part by selecting the Producer WSDL Address and a document library. Now you have a page with a CMIS connection to the document repository configured and ready for a CMIS compliant client such as Open Text to access (Who pledged to support CMIS in 2008). Managed metadata fields seem like not supported by this connector, need more research.
How to install can be found here on this blog
What is Open Text up to
They have a feature called OpenText Content Management Lifecycle Services which is available on the OpenText Application Governance and Archiving for SharePoint solution where Sharepoint is front end and OpenText is on the back end. They provide the complete lifecycle from provisioning sites, compliance, metadata to final archiving all in SharePoint user interface. You cannot see open text anywhere. This is not really a connector but a complete solution.
Read all about it here and get deployment guides, white papers.
What does Gartner have to say.