Hi,
What are the specifications of the site you are importing from ?
Pascal.
I’m not sure what you mean, it’s a single site, with the most recent versions of both WP and bbpress, cheers.
Do you have any posts or forums already on the new subsite of the multisite installation ? If not, you could probably just export your whole single site with the wordpress export and then import it on the multi-side one.
Pascal.
No, I don’t have any posts or forums. What would you use to export and imoprt? I’ve already tried that, and it doesn;t seem to have included the users…
cheers
If I was to try this I would jump into the database directly to have a closer look, but thats me, and I’m pretty confident I know what I’m doing here 
Presuming your taking backups so your data is safe and you have tested restoring from backup.
I’ve never actually tried this but what happens if you de-activate bbPress on the single site and then network activate it?