I have a Groupwise 8 (latest patch) system running on NW 6.5 SP8. I need to upgrade to Groupwise 2012 SP2 and OES 11 SP1. I have the OES 11 SP1 server installed with EDirectory, server has been running fine for about 3 weeks within the existing tree. The question is can I migrate the MTA and GWIA to 2012 (OES 11) while the 2 post offices and webaccess still run on GW 8 and NW6.5? Or does the migration need to happen all together? I would prefer to do this migration in steps if possible.