Looks like Microsoft is "enabling" more and more telecom-based applications.  The latest one is the contact center, with the introduction of its Customer Care Framework, a software platform that can integrate existing OSS, BSS and CRM systems from service providers, consolidate different applications and automate workflow.  The product is based on .NET and the Web services architecture.  This development could potentially open the door for future expansion into the communications area (including call control, etc.), whenever Microsoft chooses to attack that space.