| Attribute | Must | Description |
|---|---|---|
| Delivery-Mechanism | X | The mechanism by which this MDB recieves mail - should always be MDB |
| Diagnostic-reg-key | Registry Key where the diagnostic key/values are keptlog keys/values live | |
| DXA-Task | Size limit after which messages can no longer be sent or received | |
| Home-Public-Server | Name of the Home Public Server for mailboxes on this Store. | |
| Maximum-Object-ID | ||
| MDB-Over-Quota-Limit | Default number of bytes allowed over default quota. | |
| MDB-Storage-Quota | The default max storage for new objects created in the MDB. |