User Transfer to Another Server Problem

Hello,

I have 2 Lotus Domino 7.0.1 running servers in different sites. When I try to transfer one user to another (in Admin Console People > Move Another Server) I took an error messages “The Administration Process will not be able to complete the Mail File Move operation if MAIL SERVER NAME is not running R5.0 or above.”

What can I do? and is there another way to transfer user to other server.

Thank you