I have explained this a couple of times now, but here goes again.
We were forced to move away from our old server because it reached its end of life.
The old forum system didn't work on the new server (and was outdated) so we were forced to make a choice:
1) We could either try and fix the problem, which could take forever and would be rather expensive
2) We could move to a new system.
When moving to a new system there were two options:
1) Migrate to a new version of the old system, which would be expensive, risky and very time consuming for me and quite frankly, I d