Thanks Michael … yes, going in to this I knew that the database part was going to be the most difficult for us as I have no database experience and my tech works exclusively with MySQL.
We had discovered documentation on the web concerning merging sqlite databases but even that did not seem to be accurate.
So, maybe the thing to ask at this point - and I know it is off topic for this forum - is for guidance on merging the two databases.
I don’t believe that I have mentioned this but our only concern is mail. We do not use OwnCloud.
At this point, the mail is functioning well for the end users. The combined database that was created seems to work perfectly as far as users and passwords for the mail functions. The only issue is the inability to access the admin page as it shows a constant state of “Loading…”.