Verify that the service has been installed by checking for its name in Services under the Control Panel.
Use the PROFINST sample application if you want to create a profile for the service to use each time it starts. Such a profile allows you to examine the mailbox for a service. See PROFINST: Installing a MAPI Profile.
If the mailbox agent or gateway is designed to use an extension DLL, create a directory and copy the extension DLL into the directory. Use the EXTNINST sample application to install the DLL. See EXTNINST: Installing an Administrator Extension.
After installing a service, you can control it with the Windows NT service control manager. Using SERVINST has no effect on objects in the directory.