just recently i did this for a small business ( 4 PC networked with no server ) it's pretty easy/weird setup but it will work. i created a shared folder for outlook on a network drive and mapped it to each PC and separate folder for each user than setup each user's email account, close the outlook and move the .pst file to the mapped drive. (if you have a backup .pst file use that one) now when you open outlook it will complain that it can not find the PST file and there you can point it to the new location on the mapped drive. in my case they wanted this so they can have running backup on their main PC in case of something went wrong.