This question comes up quiet often. Can I fit my OM lenes to the 4/3rds mount? The answer yes, but the camera will not be able to communcate to the lens. So you will have to shoot in full manual. It will require an adaptor ring, check link. So if you have some really nice OM lenses that sill want to use,this is a option.

http://www.olympusamerica.com/cpg_se...mf-1/index.asp