We are currently using Netbackup 4.5 to backup our Exchange 5.5 Servers.
Early this morning, we were able to backup our Exchange Servers without any

I checked the catalogs and confirmed the databases and transaction logs were
backed up.

However, on several servers, the transaction logs did NOT get deleted from
the transaction log drive after the backup completed. They should have been
deleted. Has anyone ever seen this behavior and why does this happen?