Transport Dumpster feature in Exchange 2007
Transport Dumpster feature was introduced on the Hub Transport role in Exchange 2007.
If you had installed a CCR, there is an instance where we need to specify a Transport Dumpster and Microsoft recommends to do so on the server which holds the Hub Transport role.
The Transport Dumpster maintains the queue of messages that were delivered to mailboxes which reside in a CCR. This helps for a lossy failover which protects data by giving option to have a clustered mailbox server (CMS) automatically come online on another node with a limited amount of data loss. Thus, in an event of a lossy failover, exchange automatically re-delivers the recent e-mail messages to user mailboxes on the failed over CCR using the transport dumpster where the e-mail messages were still stored.
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Ratish
