Windows 8 GPO Blocking Connection Accounts

In Windows 8 you can associate your domain user account with your Microsoft Live ID. Not something that the enterprise would necessary welcome ... so how do you disable it.

Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\Accounts:Block Microsoft Accounts

If you disable or do not configure this policy, users will be able to use Microsoft accounts.

If you select the "Users can’t add Microsoft accounts" option, users will not be able to create new Microsoft accounts on this computer, switch a local account to a Microsoft account, or connect a domain account to a Microsoft account. This is Microsoft's preferred option if you need to limit the use of Microsoft accounts in your enterprise.

If you select the "Users can’t add or log on with Microsoft accounts" option, existing Microsoft account users will not be able to log on to Windows. Selecting this option might make it impossible for an existing administrator on this computer to log on and manage the system.

I would expect the latter option to be the case in a Windows 2008/ Windows Server 2012 enterprise.