Also searched as: memorandum of understanding
Treat the MOU as the deal itself, not a formality before the deal. Everything negotiable, fee splits, furniture, the transfer date, rent-back arrangements, must be written into it, because at the trustee office only what is on paper counts.
This explains the general case. If MOU has come up in a live deal of yours, talk to the team: specific answers, registered numbers, no obligation.