If in a cluster or replicated environment, perform the steps in the following procedures on each Exchange node. Also perform these steps on the Exchange Client Access Server (CAS).
To configure the NetBackup service account (Exchange 2010)
In Active Directory Users and Computers, select the Users directory.
Right-click on the Administrator account, click Copy, and create an account for NetBackup.
Create a user account that has a mailbox with a unique name. A unique name is one that does not already exist within the Exchange Organization. This name cannot be contained as a set of characters in an existing name.
For example: EXCH1 is entered as the unique mailbox name, and other mailbox names such as EXCH1BACKUP or BACKUPEXCH1 exist. The backup or restore of individual mailboxes or both fail.
Click Add and add this account to the following groups Domain Admins group:
If you receive an "Access is denied" error when you perform a restore, you may need to run the following commands:
New-ManagementRole -Name EWSImpersonationRole -Parent ApplicationImpersonation New-ManagementRoleAssignment -Role EWSImpersonationRole -User Administrator EWSImpersonationRoleAssignment
where Administrator is the alias of the Active Directory account you want to use.
More Information
Configuring the log on account for the NetBackup Client Service
About NetBackup and Microsoft Exchange Web Services (Exchange 2010)