As the Sneakster said it's not possible to merge the 2 boards.
I've msg'd Emma offline asking her when ESMB will be back...
I know there were technical barriers to doing that in the past. I wonder if it is possible now.
From the xenforo manual:
This section covers importing content from other forum platforms into XenForo, including configuration, running imports, and post-import tasks.
xenforo.com
Importing data from other software
XenForo has the ability to import information from other forums, including users, forums, threads, posts and private messages, along with various other data.
This can be extremely useful if you are migrating your forum from another software package, or if your forum needs to merge with, or absorb another forum site.
XenForo importers are now installed via a separate add-on which you can download from your
Customer area.
At the time of writing, XenForo 2 supports importing data from the following sources:
- XenForo 2.x
- vBulletin 3.6 to 5.3
- IPS 4.x
- phpBB 3.2 to 3.3
- SMF 2.0
- MyBB 1.8
- Discourse 2.x
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Is this part (below) a deal breaker?
Retain content IDs
At this point, you will also be asked if you want to
Retain content IDs. This option can only be used on a completely empty XenForo installation, that has no threads and posts. The setting will attempt to retain the IDs of the data that is imported, so that a thread that has an ID of 2563 in the source database will be imported with an ID of 2563 in the XenForo database.
If
Retain content IDs is not selected, data will be imported with sequential IDs that do not match the source database. This is the default option, and in most cases is faster and more reliable.
Don't worry about existing links in search engines etc. pointing to URLs using the old source IDs. Many importers supply
redirection scripts that can seamlessly redirect visits to old pages in your source system to their corresponding new pages in XenForo.