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    *****************************************************************************
    **
    ** API Change History
    **
    *****************************************************************************
    Changes since the QMF-1.0 release on 15/05/09:
    1. Changed 'QMailMessageSource::prepareMessages(const QMailMessageIdList&)' to
               'QMailMessageSource::prepareMessages(const QList<QPair<QMailMessagePart::Location, QMailMessagePart::Location> >&).
    2. Added 'QMailMessageSink::messagesFailedTransmission(const QMailMessageIdList &ids, QMailServiceAction::Status::ErrorCode)' signal.
    3. Changed 'virtual bool QMailMessageSink::cancelOperation()' to
       'virtual bool QMailMessageSink::cancelOperation(QMailServiceAction::Status::ErrorCode code, const QString &text)'
    4. Added 'bool QMailMessageSink::cancelOperation()'
    5. Added concurrent version to QMailMessageSource and QMailMessageSink
    6. Added QMailMessageBuffer
    7. Added QMailMessageService::useConcurrentActions()
    8. Changed semantics of QMailMessageBuffer::setCallback(), this function no longer creates a copy of the QMailMessage
       argument, the caller must now handle lifetime management.
    9. Added QMailHeartbeatTimer.
    *****************************************************************************
    Changes since the development preview release on 03/04/09:
    1. Added 'QMailTransport::socket()'.
    *****************************************************************************
    Changes since the development preview release on 06/03/09:
    1. Added 'QMailAuthenticator::useEncryption(const QMailAccountConfiguration::ServiceConfiguration&, const QStringList &)'.
    *****************************************************************************
    Changes since the development preview release on 16/01/09:
    1. Added 'QMailAuthenticator' class.
    2. Added 'QMailServiceConfiguration::QMailServiceConfiguration(const QMailAccountConfiguration::ServiceConfiguration&)'.
    3. Added 'QMailServiceConfiguration::id() const'.
    4. Added 'QMailTransport::isEncrypted() const'.
    5. Changed 'QMailMessageSource::notImplemented()' from slot to function.
    6. Added 'QMailMessageSink::notImplemented()'.
    7. Added 'QMailMessageService::accountId() const'.
    8. Changed 'QMailMessageSource::retrieveMessagePart(const QMailMessageId &, const QMailMessagePart::Location &)' to
               'QMailMessageSource::retrieveMessagePart(QMailMessagePart::Location &)' and
               'QMailMessageSource::retrieveMessagePartRange(const QMailMessageId &, const QMailMessagePart::Location &, uint)' to
               'QMailMessageSource::retrieveMessagePartRange(QMailMessagePart::Location &, uint)'.
    9. Changed 'QMailMessageSource::retrieveAll(const QMailAccountId &, QMailRetrievalAction::RetrievalSpecification)' to
               'QMailMessageSource::retrieveAll(const QMailAccountId &)' and
               'QMailMessageSource::synchronize(const QMailAccountId &, QMailRetrievalAction::RetrievalSpecification)' to
               'QMailMessageSource::synchronize(const QMailAccountId &)'.
    *****************************************************************************
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