BITS

BITS is used to upload PST data from a workstation to the uploads directory on the PST Flight Deck server.  In a default configuration, BITS will determine the total bandwidth available to a client and dynamically throttle the upload of a PST file by balancing client workload and bandwidth availability.

A fully-loaded environment

A “fully-loaded” migration environment has plenty of work to be performed at all stages of the migration and in queue to start. What exactly it is is dependent upon your module configuration and is sometimes limited by preceding projects (like mailbox migrations) or even total work to be accomplished.