Systems: 3 Groupwise Servers, all Win2k3 w/eDirectory 8.8 sp5

Last week we upgraded the primary domain and main post office to GW8 from GW 7.0.3 on one of our servers. This went fine and without incident. We still have a 2ndary domain with the GWIA and WebAcc and another 2ndary domain with another Post Office. To upgrade the GWIA and WebAcc is it recommended to delete (from Console One) the existing GWIA and then re-create during GW8 install and then do same w/Webacc? Also, if I wanted to rename the services is the only way to do it is to uninstall the agents and re-install? Thanks.