Communicator 2007 R2 fails to open new window when double-clicking a Contact

When using Microsoft Office Communicator 2007 R2, double-clicking a Contact fails to launch a new conversation window.  However, you are still able to right-click a Contact, and start an IM session by selecting “Send an Instant Message.”

Cause: When double-clicking a Contact, OC 2007 R2 uses XML to initialize a new conversation window, and we’re finding several customers who have incompatible and/or legacy builds of MSXML.DLL that are encountering these failures.

Resolution: To resolve this issue, please install XML Version 6.0 and XML Version 3.0 SP7.

Thanks to Scott Oseychik for posting the solution here:

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