Backup Exec looking at Incorrect Location for Exchange Store

I inherited a network that has an Exchange server running with the information store located on an external hard drive.

When I try to run a backup of Exchange through BackupExec, the backup fails because it says it cannot find the information store.

So looking up information about where BackupExec is looking for the Information Store, it is looking in:

\\servername\Microsoft Information Store\Public Folder Database 1234567890\

Where hte actual location is:

e:\Microsoft\Exchange\mailbox\first storage group\ etc.....

So I am haivng difficulty in finding where I can actually point BackupExec to look in the right location so the backup process can complete as it should.

Any suggestions?