This is an issue with MAPI specifically on Outlook 2007, solution for this issue is available in latest release for NetBackup DLO i.e. 6.1 MP4 and will be available in next release for BackupExec DLO.
Latest release NetBackup DLO 6.1 MP4 has resolved this issue of Outlook 2007 getting hang when DLO perfoms backup of PST file. There is a new method/option for PST backup which perfoms message level incremental backups to local cache and then periodi...