The Tools Panel of the Motif Client has buttons associated with the tools that were appropriate to MAILbus Monitor V2.0. If you are currently using MAILbus Monitor V2.1 successfully, you will already have updated the tools that the Tools Panel buttons point to.
To associate the buttons in the Tools Panel of the Motif client with the appropriate tools for Mail Monitor, go to the Tools Panel. Select the File/Configure Tool... menu option and click the Default Tool... button.