The Global ARCHICAD Community

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Import/Export to other CAD/BIM formats (DWG/DXF, IFC, SketchUp, 3DS etc.), spreadsheets, databases etc.

Moderators: Barry Kelly, Karl Ottenstein, LaszloNagy, ejrolon, gkmethy

You can save to DGN though you cannot specify which version. I would assume that at a minimum it should be the years prior, AC21 came out in 2017 so it should support Microstation version that came out in 2016.
MicroStation has been on version 8 for a very, very long time. Archicad will not save or import V8. It will only work with V7. I tried saving my V8 files down to V7 to import them. The result was very disappointing. It was a little better when they were converted to dwg.
It really is a shame that Graphisoft ignores the next best BIM software on the market. There are many things AECOSIM Building Designer does better than Archicad.