=LOOKUP(A1,{"MP ","MP1 ","MP2 ",...},{"User 1","User 2","User 3",...}).
I have to work with "MP#" format as being a 6 character field as it is imported from another source. For some reason MP3, 6, 5, 8, & 9 are all returning the last User instead of the correct one. Now I have to find...