Prior to Windows Server 2008, there was no way for administrators to manually revoke issued licenses. Issued licenses would automatically expire after a random period between 52-89 days and become part of the available license pool. In some cases, an administrator might want an issued license to become available immediately—typically when a particular machine will no longer be used (for example, the machine is being reformatted) and the license must be made available immediately to another client without waiting until it expires. To address this, we now have a method of revoking a license manually.
Currently, revocation support is only for per-device CALs. Per User Terminal Server mode is not enforced in Windows Server 2008, so there will not be any denial of service from terminal server.
You can only revoke 20% of a specific version of a CAL or one CAL, whichever
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