[Yahoo! Inc. Skype 3]

Here is the Skype Network Admins Guide containing all the reg keys that control settings:

http://www.skype.com/security/network-admin-guide-version2.2.pdf

And here is the Skype ADM for GPO control:

http://www.skype.com/security/Skype-v1.7.adm

Link to business MSI version of Skype:

http://www.skype.com/intl/en-gb/download/skype/windows/business/