Don't read this below unless you really want to. Meh, the episode is flawed from within, so it probably won't hurt either...:rolleyes:
"Six years in the future, an emotional Captain Archer and the crew return to Earth to face the decommission of Enterprise and signing of the Federation charter, ratifying the newly-formed alliance of planets they helped forge."
These events will be shown as a holodeck simulation, which is viewed by Troi and Riker on the future Enterprise-D. Plus the episode involves the loss of a major crew member.
It's probably best to consider Enterprise over with "Terra Prime".
B&B's Egos would never have allowed that