Hi Chris (Riley),
Thanks for your support. We have found out the cause of my Exchange Transaction Logs not pruning:
Exchange Transaction Logs only get pruned if both the Transaction Logs AND the Storage Group databases are backed up under a SINGLE BACKUP JOB.
My backup strategy was:
System Backup: One Backup Job running a full backup of C: (System Drive) once a week.
Data Backup: One Backup Job running a backup of D: (Data Drive) daily - Weekly Scheduled Base followed by Daily Incrementals.
It so happened that following advise to hold Logs and Database on separate volumes, my Transaction Logs were located on the C: drive and got backed up via the first Job and my Storage Group databases were located on the D: drive and got backed up daily. As both objects were not backed up under a single job, the logs were not pruned.
Thanks again for your help in this matter. Hopefully this discussion will help others out. I think it would be good also to make the explicit point about "both TLogs and Storage Groups under a single job" in the knowledge base.
Kind Regards,
Chris.