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The CAD to Geodatabase tool in ArcToolbox produces an empty feature dataset in the output geodatabase.
The version 8 DGN file selected as input for the tool has not been compressed in Microstation v8 or Microstation v8 XM.
To compress the v8 DGN file in Microstation, click File > Compress > Design. After the file is compressed, save the file again.
In Microstation v8 XM, the file can be compressed automatically on SAVE. Go to Workspace > Preferences > Category list. Select Operation, and check the box labeled "Compress File On Exit". The files are compressed during the SAVE process.