The PR_EMS_AB_MDB_USE_DEFAULTS property determines whether a mailbox or public folder uses the storage quota set on the information store or the storage quota set on the object itself.
| Header file: | EMSABTAG.H | 
| Applies to: | Mailbox and Public-Folder objects (directory objects). These objects appear to MAPI as messaging_user objects, which are accessible through the MAPI IMailUser interface. | 
| Identifier: | 0x80d4 | 
| Property type: | PT_BOOLEAN | 
| Access: | Read/write | 
When the PR_EMS_AB_MDB_USE_DEFAULTS property is set to TRUE, Mailbox and Mailbox-Agent objects take their storage quota settings from the PR_EMS_AB_MDB_STORAGE_QUOTA and PR_EMS_AB_MDB_OVER_QUOTA_LIMIT properties on the server’s MHS-Message-Store object.
When PR_EMS_AB_MDB_USE_DEFAULTS is set to TRUE, Public folder objects take their storage quota settings from the PR_EMS_AB_MDB_STORAGE_QUOTA property on the server's MHS-Public-Store object.
PR_EMS_AB_MDB_OVER_QUOTA_LIMIT, PR_EMS_AB_MDB_STORAGE_QUOTA