Hi,
The logon account used for backup must have a mailbox in the Exchange organization. The Backup Exec uses this mailbox to access user mailboxes. Please perform below given steps that will help you in resolving the issue:
1. Create a new user account (for example "bkadmin").
2. Make "bkadmin" a member of Domain and local Administrator group of the Exchange server.
3. Start System Manager -> Right click the organization to start "Delegate control" wizard and grant "bkadmin" user "Exchange Full Administrator" rights
4. Create a mailbox for "bkadmin" account.
5. Configure Outlook profile for "bkadmin" account and send/receive mails.
6. Make sure this account is common logon account. To accomplish this follow the steps given below.
- Start Backup Exec
- Select Tools > Wizards > Logon account wizard
- Add new logon account, type in the credential for the new account.
- Make this account a common logon account.
- Complete the wizard.
9. Create a new backup job, perform the backup and observe the results.