MAPISession Action Constants
| Constant | Value | Description |
| mapSignOn | 1 | Log user into account |
| mapSignOff | 2 | End messaging session |
MAPIMESSAGES DELETE CONSTANTS
| Constant | Value | Description |
| mapMessageDelete | 0 | Delete current message |
| mapRecipientDelete | 1 | Delete the currently indexed recipient |
| mapAttachmentDelete | 2 | Delete the currently indexed attachment |
MAPI Controls' Error Constants
| Constant | Value | Description |
| mapSuccessSuccess | 32000 | Action returned successfully |
| mapUserAbort | 32001 | User canceled process |
| mapFailure | 32002 | Unspecified failure |
| mapLoginFail | 32003 | Login failure |
| mapDiskFull | 32004 | Disk full |
| mapInsufficientMem | 32005 | Insufficient memory |
| mapAccessDenied | 32006 | Access denied |
| mapGeneralFailure | 32007 | General failure |
| mapTooManySessions | 32008 | Too many sessions |
| mapTooManyFiles | 32009 | Too many files |
| mapTooManyRecipients | 32010 | Too many recipients |
| mapAttachmentNotFound | 32011 | Attachment not found |
| mapAttachmentOpenFailure | 32012 | Attachment open failure |
| mapAttachmentWriteFailure | 32013 | Attachment write failure |
| mapUnknownRecipient | 32014 | Unknown recipient |
| mapBadRecipType | 32015 | Invalid recipient type |
| mapNoMessages | 32016 | No message |
| mapInvalidMessage | 32017 | Invalid message |
| mapTextTooLarge | 32018 | Text too large |
| mapInvalidSession | 32019 | Invalid session |
| mapTypeNotSupported | 32020 | Type not supported |
| mapAmbiguousRecipient | 32021 | Ambiguous recipient |
| mapMessageInUse | 32022 | Message in use |
| mapNetworkFailure | 32023 | Network failure |
| mapInvalidEditFields | 32024 | Invalid editfields |
| mapInvalidRecips | 32025 | Invalid Recipients |
| mapNotSupported | 32026 | Current action not supported |
| mapSessionExist | 32050 | Session ID already exists |
| mapInvalidBuffer | 32051 | Read-only in read buffer |
| mapInvalidReadBufferAction | 32052 | Valid in compose buffer only |
| mapNoSession | 32053 | No valid session ID |
| mapInvalidRecipient | 32054 | Originator information not available |
| mapInvalidComposeBufferAction | 32055 | Action not valid for Compose Buffer |
| mapControlFailure | 32056 | No messages in list |
| mapNoRecipients | 32057 | No recipients |
| mapNoAttachment | 32058 | No attachments |
MAPIMessages Reciptype Constants
| Constant | Value | Description |
| mapOrigList | 0 | Message originator |
| mapToList | 1 | Recipient is a primary recipient |
| mapCcList | 2 | Recipient is a copy recipient |
| mapBccList | 3 | Recipient is a blind copy recipient |
MAPIMessages Attachtype Constants
| Constant | Value | Description |
| mapData | 0 | Attachment is a data file |
| mapEOLE | 1 | Attachment is an embedded OLE object |
| mapSOLE | 2 | Attachment is a static OLE object |