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Some mail clients or other third-party SMTP-based clients notate message priority by using the X-Priority header. When a mail client or a third-party SMTP-based client submits an X-Priority header that contains additional comments, Microsoft Exchange Server 2007 cannot parse the X-Priority header. Instead, Exchange Server 2007 handles the message as if the message has a normal priority.
To resolve this problem, install Update Rollup 7 for Exchange 2007 Service Pack 1. For more information about Update Rollup 7 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: