The PR_MESSAGE_FLAGS property contains a bitmask of flags indicating the current state of a message.

Header file:	MAPITAGS.H
Must be exposed by:	Message objects
Identifier:	0x0E07
Property type:	PT_LONG
Property tag:	0x0E070003

The PR_MESSAGE_FLAGS property is a nontransmittable message property exposed at both the sending and receiving ends of a transmission, with different values depending upon the client application or store provider involved. This property is initialized by the client or message store provider when a message is created and saved for the first time and then updated periodically by the message store provider, a transport provider, and the MAPI spooler as the message is processed and its state changes.

PR_MESSAGE_FLAGS exists on a message both before and after submission, and on all copies of the received message. Although it is not a recipient property, it is exposed differently to each recipient according to whether it has been read or modified by that recipient.

The message is an associated message of a folder. The client or provider has read-only access to this flag.

The messaging user sending was the messaging user receiving the message. The client or provider has read/write access to this flag until the first IMAPIProp::SaveChanges21IFXQ call and read-only thereafter. This flag is meant to be set by the transport provider.

The message has at least one attachment. This flag corresponds to the message s PR_HASATTACH property. The client has read-only access to this flag.

A nonread report needs to be sent for the message. The client or provider has read-only access to this flag.

The message is marked as having been read. This can occur as the result of a call at any time to IMessage::SetReadFlag1ASOHJP or IMAPIFolder::SetReadFlagsMUEMAN. Clients can also set this flag by calling a message s IMAPIProp::SetProps method before the message has been saved for the first time.

The message includes a request for a resend operation with a nondelivery report. The client or provider has read/write access to this flag until the first IMAPIProp::SaveChanges21IFXQ call and read-only thereafter.

A read report needs to be sent for the message. The client or provider has read-only access to this flag.

The message is marked for sending as a result of a call to IMessage::SubmitMessage6BOP2F. Message store providers set this flag; the client has read-only access.

The outgoing message has not been modified since the first time that it was saved; the incoming message has not been modified since it was delivered.

The message is still being composed. It is saved, but has not been sent. The client or provider has read/write access to this flag until the first IMAPIProp::SaveChanges21IFXQ call and read-only thereafter. If a client doesn t set this flag by the time the message is sent, the message store provider sets it when IMessage::SubmitMessage is called. Typically, this flag is cleared after the message is sent.

A client or message store provider can check the current state of the message at any time by calling the IMAPIProp::GetPropsK06IXU method to read the flag values. The client or provider can also call the IMAPIProp::SetPropsXCFLAC method to change any flags that currently have read/write access.

Several of the flags are always read-only. Some are read/write until the first call to the IMAPIProp::SaveChanges21IFXQ method and thereafter become read-only as far as IMAPIProp::SetProps is concerned. One of these, MSGFLAG_READ, can be changed later through IMessage::SetReadFlag1ASOHJP or IMAPIFolder::SetReadFlagsMUEMAN.

The initial values for PR_MESSAGE_FLAGS are typically MSGFLAG_UNSENT and MSGFLAG_UNMODIFIED to indicate a message that has not yet been sent or changed. When a message is saved for the second time, the message store provider clears the MSGFLAG_UNMODIFIED bit. Another value that a message store provider can set when a message is saved is the MSGFLAG_HASATTACH flag. MSGFLAG_HASATTACH indicates that the message has one or more attachments. The PR_HASATTACH property is computed from this setting.

When a client calls the IMessage::SubmitMessage6BOP2F method to send the message, the message store provider makes a copy of it for the MAPI spooler and updates PR_MESSAGE_FLAGS by setting the MSGFLAG_SUBMIT bit. The message store provider also sets MSGFLAG_UNSENT if it is not yet set. MSGFLAG_SUBMIT indicates that SubmitMessage has been called, beginning the send process, and that the message is now read-only to clients. MSGFLAG_UNSENT indicates that the MAPI spooler is handling the message. If the send process is canceled, the message store provider resets this value.

As a message is given to a transport provider for delivery, the transport provider sets the MSGFLAG_FROMME flag if the sender had the same account on the messaging server as the message was received on. Transport providers set MSGFLAG_FROMME for an incoming message that has been sent from the currently logged on user. A client can use this value to determine that it is more appropriate to show recipient names in the contents table of the Sent Items folder than sender names. Messages that have been saved during the composition process and not yet sent should also be displayed with recipient names rather than sender names.

For an incoming message, a message store provider clears the MSGFLAG_READ flag to reset its read status. A client can set or clear the MSGFLAG_READ flag when it is necessary to change the read status and control the sending of read and nonread reports by calling either the message s IMessage::SetReadFlag1ASOHJP method or its folder s IMAPIFolder::SetReadFlagsMUEMAN method. The main difference between these methods, other than the object implementing them, is that the folder method can affect one, several, or all of the messages in the folder. The message method affects a single message.

Message store providers also set the MSGFLAG_UNMODIFIED flag for incoming messages. MSGFLAG_UNMODIFIED indicates that a message has not changed since delivery. A client cannot clear this value after it has been set by a message store provider.