During the installation of Exclaimer Signature Manager Exchange Edition on a Microsoft Exchange 2010 server, the following error message may occur:

Error 28001. The cmdlet Exchange PowerShell Agent Registration is not available

When performing the installation with msiexec logging enabled, a more detailed error message below is shown:

Error 28001. The cmdlet is not available the Exchange PowerShell Agent Registration.
System.Management.Automation.PSArgumentException: The Windows PowerShell snap-in "Microsoft.Exchange.Management.PowerShell.Admin" is not installed on this computer.
at System.Management.Automation.PSSnapInReader.ReadOne (RegistryKey mshSnapInRoot, String mshsnapinId)
at System.Management.Automation.Runspaces.MshConsoleInfo.AddPSSnapIn (String mshSnapInID)
(String name, PSSnapInException & warning) in System.Management.Automation.Runspaces.RunspaceConfigForSingleShell.DoAddPSSnapIn
at Exclaimer.Install.Core.CustomActions.CoreActions.RegistrationHelper.GetRunspace ()
at Exclaimer.Install.Core.CustomActions.CoreActions.RegistrationHelper.RunCommand (Command cmnd)
at Exclaimer.Install.Core.CustomActions.CoreActions.RegistrationHelper.UnregisterAgentRouting(CoreAgentInfo Agent)
at Exclaimer.Install.Core.CustomActions.CoreActions.RegistrationHelper.RollbackAgentRegistration ()
(Session session, Action`1 action) at Exclaimer.Install.Core.CustomActions.CoreActions.RunAction


The following steps involve modification to the registry. Serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, please refer to the following Microsoft page: Back up the registry

1. Click Start, type regedit in the search box, and then click on Regedit.exe

2. In the left pane of the Registry Editor, navigate to \HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange

3. In the left pane of the Registry Editor, delete the registry key v8
4. Close the Registry Editor
5. Install Exclaimer Signature Manager Exchange Edition

Mail Disclaimers Signature Manager Exchange Edition Troubleshooting