I just saw the recording of the Microsoft Services Connector (a free tool for connecting Active Directory to services from Microsoft) was online (watch it + pptx)
Come and get the CTP and the Admin guide
It works by federating your Active Directory with Microsoft services. Your employees will be able to access services with their corporate accounts, the same way they access the applications they use today.
Microsoft Services Connector will work for most Microsoft services, including those offered by third parties that use Microsoft developer services.
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