I am upgrading only some of the GW 7 mailboxes to GW 8. I will be making a GroupWise 8 Post office and Primary Domain on another server and moving some of the users from the GW7 PO to the new GW8 PO. But I know it says that the secondary domain / GWIA and Webaccess need to stay at GW 7 but how about the MTA?

According to the Calendonia book, I am to upgrade the MTA to GW 8?

Just want to make sure I am reading that right.