DCOM error in Event Viewer when installing Backup Exec

I am trying to install Backup Exec Agent accelerator from my PDC which is the Backup Exec Server to my Exchange Server which is a BDC.  I get an error message saying it can not create objects on the Excnage server.  My event viewer on the PDC shows an error "DCOM was unable to communicate with the computer MAIL using any of the configured protocols."  This seems to be the root of my problem.  Any ideas?
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oh,  run dcomcnfg.exe to configure DCOM
and make sure the user have rights to access DCOM, and make sure Exchange is installed properly

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