The actual size of the quarantine exceeds the "Maximum size of quarantine" setting set under Quarantine Thresholds.
You have changed the maximum size of the quarantine and checked the "delete oldest items" setting. However, the actual size of the quarantine exceeds the set limit.
When you set the maximum size of the quarantine database to a value larger than 4 GB, the quarantine size limit does not work as expected.
This problem is fixed in Symantec Mail Security 6.5 for Microsoft Exchange. To learn how to obtain the latest version, read Where to download the latest version of Symantec Mail Security for Microsoft Exchange.
If you cannot upgrade, you can work around the problem by setting the maximum size of the quarantine to 4 GB or less.
To reset the quarantine size limit