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Provides the ability to query the status of, and mark a message as heard/unheard.
/messages GET returns all messages in mailbox
/messages/{messageid} where {messageid} is the unique message ID for the message, an 8 digit number. /heard PUT (no body) Marks the message heard (and updates MWI)
GET returns message heard status.
The body returned is the XML fragment
<heard>true|false</heard>
DELETE Marks the message unheard (and updates MWI)
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