Exporting/Importing Moddels

HI everyone, I need a little help: How do i export a model from Zbrush to blender, and vice versa? Also, for Maya and 3DSMax?

I would expect that all of the packages you mention would allow exporting and importing to at least the .OBJ file format. Take a look at the Import and Export options on the File menu in Blender and match them to what option you have in the other packages.