Ok I am ready to dive into this upgrade to GW8. I have made a secondary on my GW7 system and promoted it to Primary and all is good with the world.

I now need to upgrade my Primary domain and MTA to GW 8 and create a new GW 8 Post office in order to upgrade only some of my mailboxes.

Can I do this with the secondary domain / MTA / Postoffice / GWIA running or do they need to be shut down as well as the primary domain / MTA?

If they stay running do I need to suspend communications in the secondary MTA to the primary domain?

Just wondering,