If you have downloaded a Trial version of Microsoft Dynamics CRM, and later purchase Volume License media and do not wish to re-install, you may input the license key from your purchased media within the Microsoft Dynamics CRM Deployment Manager.
When the trial period is about to expire then you will start getting the following warning everyday starting from 5 days back.
And after the Trial period expires, you wont be able to use CRM any further :
Microsoft Dynamics CRM 2011 media obtained under Volume Licensing programs include license keys embedded on the media (Media is Pre-Keyed). The license keys will no longer need to be entered upon installation.
But the License Key can be found by searching the installation files contained on the media or downloaded .ISO file under the \server\amd64\license.txt file.
Open the Deployment Manager and Select Change Product Key. Enter the key as in license.txt file. and then click on Refresh Button.
You are good to go again !!!