I am using version 4.2.12.4

What is the best way (if any) to setup TB! so I can use it on more than one workstation. I used TB! about 5 years ago at a place I was working for and they had 5 users and workstations all using one file system so anyone could reply to emails in the main account.
I can't seem to do this, TB! will open on both workstations but the second I change something on either of the workstations and closing TB! (doesn't matter which wokrstation I close first) it will freeze TB! and I have to open TaskManager and kill it or it will sit until I do so. The workstation that closes TB! last never freezes up...
I messed with the Sync for a second but that is for workstations that are using seperate data folders if I'm not mistaken? Since all the sync did was create some duplicates emails in the data folder for me anyways.
Anyone have any solution for me?