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[Tobi]

If a migration is to be considered, best is to find a software that is maintained. SMF seems to be dormant since 2023. It never was a fast evolving forum but it seems almost abandonware.

It seems they are developing on a new major release (see https://github.com/SimpleMachines/SMF). MyBB also seems to work on a new minor 1.9 release.

Also what modifications we have now should be retained in the new forum ?  Is it worth all the hassle to pull it over ?

That's exactly what I think.