You couldn't be more wrong with your first comment. EMC Data Domain Boost Compatibility Matrix (8/1/2012 includes BE 2012. 3/10/2011 includes BE 2010 versions). Backup Exec 2012 is DDBoost compatible with OST plugin 2.5.0.3 (Restricted Availability currently, contact support). Backup Exec 2010 is DDBoost compatible with OST versions BE R3 (2.4.1.0, 2.3.3.0, 2.3.1.0), BE R2 (2.3.3.0, 2.3.1.0, 2.2.3.0, 2.2.2.0, 2.2.1.1) depending on you DD OS version.
Please don't confuse people with false information. DD Boost is fully supported with Symantec Backup Exec as well as EMC Avamar, EMC NetWorker, EMC Greenplum, Quest vRanger Pro, Symantec NetBackup, and DD Boost for Oracle RMAN.