| Property | Description | Type | Access Mode |
| Concatenate | Specifies whether concatenated long incoming messages are to be read as a single message or part messages [True: Read as one message (default); False: Read as part messages] | Boolean | Read/Write |
| Count | Number of incoming messages in Inbox | Integer | ReadOnly |
| HasMessages | Whether Inbox has any messages | Boolean | ReadOnly |
| IsEmpty | Whether Inbox is empty (does not have any message) | Boolean | ReadOnly |