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Can you see the SQLBackup.exe process crashing on this server? Also just to confirm, the backups are not running off the SQL agent showing on the physical nodes, but you have the cluster clients created per cluster as outlined here, correct? http://documentation.commvault.com/commvault/v11/article?p=4977.htm
Make sure the ...
There are two additional settings you should configure: http://documentation.commvault.com/additionalsetting/?q=sOffice365OriginatingServerFilter
Just to clarify you are just installing the index store package on a server? What version of Commvault are you installing (v11 SP11/12?) and would it be possible to get the install log file from the server in question?