revoked licence

Take it off the domain (join workgroup), reboot, and then re-add it to the domain and reboot again. You may have to change the computer name as well.

I may be misunderstanding your question?

this is for exchange 5.5 under licence manger the client was revoked accidentally

Point value changed by question poster.

From MS Knowledge Base 248430

Sometimes the license server has problems validating license, and you find yourself in a position where you know the license to be good, but they License Server thinks otherwise. Deleting the old license key in the registry will allow you to renew the license.

Before attempting to do so, make sure that you understand the registry editor (regedit).

Create a backup (export) of your registry before actually making any changes. Then navigate to key HKEY_LOCAL_MACHINE\Software\Microsoft\MSLicensing\Store\LICENSE00x (x will probably be either 0 or 1). Right click to remove/delete the key, close the registry editor. Then restart your Terminal Services, it should renew the license (provided you really do havea valid license)

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