Microsoft Exchange Server rules are evaluated against each message coming into a folder or mailbox. The CRARUN sample application is a client-side rule extension that launches an application on the client. See Installing the CRARUN Launch Application and Running the CRARUN Launch Application.
\BKOFFICE\SAMPLES\EXCHANGE\CRARUN
To install the CRARUN sample application, the installation of the CRARUN sample application needs REGINI.EXE, which is found in the Windows NT Resource Kit. This means that you must first modify the registry manually using the REGEDT32.EXE utility.
4.0;path\crarun.dll;1;00000101001100
where path is replaced by the full path name, including the drive letter, to CRARUN.DLL.