Every time I flag a question for migration I see a good number of related questions that could be flagged for migration as well.
It's also to easy to find tags where most posts tagged so belong to, say, serverfault -- try the 5K+ questions tagged IIS.
Either give us (you have 331 Deputies and it's growing fast when I got mine a few days ago there were only 328) a lot of flags for cleanups or ... abandon trying...?
IIS
should be moved to SF. There are grey zones.