Hi Ed!
Thanks for asking about this. You can follow the steps here to accomplish this:
Migrate SmarterMail to a Different Server. Typically we recommend migrating to the same version; however, since you're only two majors away and there weren't any major file structure changes, it shouldn't cause any problems.
If you want to break it up into two steps you can either upgrade first and then migrate or vice versa. Here's the article on how to do a
Major Upgrade of SmarterMail in case that's the route you take.
Hope that helps!
Andrea Free
SmarterTools Inc.
877-357-6278
www.smartertools.com