Use the DXF Format in AutoCAD

Open up AutoCAD the way you normally would. Be sure to save any work before moving on to something new. Create a new design drawing using the drawing tools. You can create layers if you wish, but know that they may not appear in the DXF format depending on the version of AutoCAD you use.

Know that older versions of AutoCAD don't support DXF. You need to have at least version 10 or higher to save drawings as DXF files. AutoCAD 2008 has almost made DXF obsolete with the file saving options it provides.

Save your drawing as a DWG file. This will enable you to go back to the original file if necessary so you can modify layers and blocks that might loose their attributes when saved as a DXF. To avoid this, keep the original DWG file and back it up so that if it becomes corrupted you have something to go back to.

Export your drawing to DXF format by using the "DXFOUT" command. This creates a copy of your drawing in DXF format. Pass your drawing file along to the other user. Have the other user open the drawing using Microstation or whatever drafting software they use that reads DXF format. In AutoCAD you can import DXF files by using the "DXFIN" command.