Is mailbox data streamed directly from the source server to the target server? (NETIQKB22051)

goal
Is mailbox data streamed directly from the source server to the target server?

fact
Exchange Migrator 1.x

fact
Exchange Migrator 2.x

fix

Mailbox data is not streamed directly from the source to target servers. All data is driven through the Exchange Migrator (EM) console machine.  There are three major calls used by the EM console in driving the migration:

1. Directory level calls (SAM, AD, etc.)
   
• Directory level calls scale well and do not impose a heavy resource price on the EM console.
  
2. Message Store calls (e.g., mailbox data, public folder data)
   
• All message store calls (using MAPI) require data to stream from the Source Exchange Server, through the EM Console, and then to the Target Exchange Server.  Be sure that you optimize network bandwidth with both the Source and Target Exchange Servers to accommodate for this.
  
3. Database calls.
   
• EM will write to the database to create the mappings for each object.

Formerly known as NETIQKB22051